Aliens Colonial Marines

This cheevo will be awarded for completion of all the challenges.

There are 86 challenges in total through 3 catagories, Marine, Campaign & Multiplayer.
You can only work on 1 challenge per catagory at a time so at all times you will have 3 active challenges.
Unfortunatly the game wont allow you to complete challenges in any order you want, they have to be done in a set order.
Luckily all challenges can either be done through the main campaign or in private multiplayer matches.

Here i will list each challenge and try to describe the easiest way to complete it.
If anyone has any easier ways please feel free to comment and i will include it and give credit where required.

Please also check the comments for various other ways the awesome TA community have found to complete these challenges and if you have left a comment and i have not put it in the guide im sorry but i obviously cant add everything but your advice is still greatly appreciated

Thanks and credit to Hordesman, shredsector, Goggs25, x PAYLOAD x, scuzzybunny,Xx SpazemxX, MunknDrunky79, Meszerus for their input.

BIG thank you to "shredsector" who has given me permission to use his guides for the campaign related challenges so head over to his solution and give him a thumbs up.


Marine Challenges:

1- Field Modified: Purchase a Marine weapon upgrade
Once you level you marine to level 2, press start and select arsenal upgrades, a weapon will be highlighted so select it and spend a point to upgrade.

2- Spray N' Pray: Kill 5 enemies with hip fire
Simple enough, just kill enemies without using LT to sight up.

3- Two For One: Kill two enemies with one shot from an Underslung Grenade Launcher
You can use any rifle as long as you select the grenade launcher attachment, select mission 1 and after you rescue keys and grab the flight recorder you will go through some corridors, just before you get into the lift there will be lots of aliens grouped together. If you dont complete the challenge just restart checkpoint and try again.

4- Boom Stick: Kill 20 enemies using the Pump Shotguns primary fire
Press and hold Y, Select secondary weapon and then choose pump action shotgun. Get 20 kills. As far as i am aware using hicks shotgun does NOT count towards this.

5- Big Fucking Signal: Track 5 xenos at once on your Motion Tracker
Select mission 1, after rescuing keys and grabbing the flight recorder, just before you get in the lift there will be far more than 5 aliens chasing you, dont kill any and press LB to pull up your motion tracker.

6- Heavily Armed: Kill 7 enemies using a primary weapons alternate fire
Simple enough, on any mission use any rifle or shotgun and press RB to kill enemies, obviously using grenade launchers on the rifles is easiest way to go.

7- Kill Or Be Killed: Kill 20 enemies with any rifles primary fire
Make sure you use any of the 3 rifles and just kill enemies untill challenge complete. Mission 2 is good place to farm this cheevo, kill all enemies at the starting area and reload checkpoint.

8- Straight Shooter: Get 10 headshots using the Service Pistol
Make sure you select the service pistol and not gormans pistol. Load up any mission and get 10 head shots, aliens and humans count and it does not have to be in a row.

9- Airtime: Kill 20 enemies that are climbing on the walls or ceiling
Load up mission 1 and again just before you get into the elevator the aliens will come down the corridor, they will be all over the walls and ceiling, reload the checkpoint and repeat untill challenge complete.

10- Pop Goes The Melon: Get 10 headshots on xenos with any rifle
Load up any mission that has an abundance of aliens and simply aim for the head.

11- Short, Controlled Bursts: Do not miss an enemy with any bullets from a full rifle mag
This is a pain in the butt hole to do in campaign, the bullet registration is awful. It can be done and take your time and make sure you get a hit with each round. You will know when a hit has registered as a small red X will flash up.
Use the battle rifle as it is single shot and only has a 15 round magazine, best done in private MP match. As a marine get a friend as an alien to find you and shoot them twice, let them regenerate health and repeat.
If your fortunate enough to have the DLC plasma pulse rifle this is much easier as it has a 4 round mag, Thanks to Xx SpazemxX & scuzzybunny

When you have to survive against the queen on second to last level go into the container with the armour and ammo and she will stand outside with her head down very easy to get on that fight if you have no mp partner. You could do the pistol one here too (Submitted by MunknDrunky79)

12- Sharp Shooter: Kill 20 enemies that are 15m away or farther, using the Battle Rifle
Make sure to select the battle rifle, Load up mission 2 and when you see an enemy back away as far as you can and kill them. Reload checkpoint and repeat.
I suggest level 7 (One Bullet). Shortly after you see the first and second spotlights, and your character comments, "They sealed it up. No Xeno can get through, they're not that stupid," you enter a small room which takes you immediately back outside. This outside portion is a rather long straight stretch. Once Bella and O'Neil move into the area, Xeno's will pounce in at varying parts of the land stretch. Position yourself at the top of the stairs in the small room, back up enough so you can make a little more distance, and shoot the Xeno's from here with your battle rifle. When they stop spawning, move out of the door yourself so more spawn, then back up and repeat for another 4-6 Xeno's. Reload this checkpoint (which is super awesomely at the bottom of the stairs) to repeat. (Submitted by Meszerus)

13- Trapper: Kill 20 enemies with Battle Rifle Mines
Make sure you select battle rifle and from the aresenal upgrade select Proc-mine launcher (alternate fire). Again load up mission 2 and use RB to kill enemies, if you run out of ammo or enemies simply reload checkpoint and repeat.

14- Second To None: Kill 15 enemies with any side arm
Again mission 2, press right on the D-pad to select side arm and kill all enemies, reload checkpoint and repeat.

15- Carry A Big Stick: Kill 3 enemies with a primary weapons alternate fire without dying
Follow same as 13 - Trapper and this is easily done.

16- Back On Your Feet: Revive 5 other players in Coop Campaign or Versus Matches
This will either come naturally through MP or coop but if you wanna get it done easily, grab a 2nd controller, sign in a guest profile and load up any mission on badass difficulty. Have player 2 stand still while P1 shoots and downs P2, now stand next to the downed friendly and hit X to revive, Repeat 4 more times and challenge complete. (1st time should net you a cheevo if you aint already got it)

17- Equal Opportunity: Kill 20 enemies using the Combat Pistol
On any mission, Press and hold Y, select combat pistol and kill 20 enemies.

18- Set Em Up, Knock Em Down: Kill 10 enemies with Claymores, Mine Launcher Mines or Acid Traps
Follow same as 13 - Trapper and this is easily done.

19- Spread The Love: Kill 2 enemies within 10 seconds using the SMG
Load up mission 2, Select the SMG as a primary weapon and kill the 1st 2 enemies that come through the door.

20- Xenophobia: Kill 10 Soldier, 10 Lurker or 10 Spitter xenos
Mission 1, After rescuing keyes just kill aliens until challenge complete, You only need 10 of 1type, Not 10 of each.

21- Blown To Hell: Kill 20 enemies using the Assault Rifles Grenade Launcher
Select the assault rifle with grenade launcher attachment. Mission 2, kill all enemies with RB when you run out of enemies or ammo reload checkpoint and repeat

22- Make It Count: Shoot enemies with an entire clip using the Service Pistol without missing or reloading
Can be done in campaign but again easier if you follow 11- Short, Controlled Bursts. I did this on mission 2, press LT and make sure every shot hits the target, ALOT easier that 11- Short, Controlled Bursts though

23- Down But Not Out: Kill an enemy while incapacitated
Grab a 2nd controller and sign in a guest, load up mission 2 and run to the 1st 2 enemies that come through the door, allow them to down you and then while you are down use the pistol to kill one of them.

24- Amateur Surgeon: Decapitate a xenomorph
I did this as i rescue keyes, i had pump action shotgun, when i got to keyes i can see the alien in the wall, i shot it and it jumped down at me, when it was on the floor it was crouched down showing me only it's head so i fired and BOOM head shot and decapitation.
Im sure this is also possible using the battle rifle and getting head shots

25- Flash Fire: Kill 2 enemies with fire damage within 10 seconds
Load up mission 1, equip the fire bombs as your tactical. When you get to the corridor just before the lift you will be attacked by multiple aliens so throw you fire bomb and carnage ensues, challenge complete.

26- Judge, Jury And Executioner: Execute 20 enemies using the Pulse Rifles primary fire
Same area as 25, Simply equip your pulse rifle and kill as many enemies as you can, reload or die and repeat untill challenge is complete.

27- Shotty Workmanship: Kill 20 enemies using the Tactical Shotguns primary fire
Same area as 25, Equip the tactical shotgun, possibly upgrade the magazine for fast reloads if you want and kill all the aliens, reload checkpoint and repeat until challenge complete.

28- Keep Up The Fire: Kill 6 enemies in under 60 seconds using the SMG
Same area as 25, Equip the SMG and upgrade the magazine size if you want to, as soon as you hit the corridor this is when you should start using the SMG, there are way more than 6 aliens to get the challenge and the 60secs is plenty of time.

29- Reflex Action: Kill 5 xenomorphs that are inside a vent using the Pump Shotgun
Mission 1, after you retrieve the flight recorder equip your shotgun, The next couple of aliens will come out of windows and vents and if your quick enough to kill them it will count towards this challenge. When you get to the corridor just before the lift an alien will come from the ceiling, kill it quickly and reload checkpoint and repeat untill complete.

30- The Silent Killer: Kill 5 enemies using a suppressor on the Battle Rifle
Same area as 25. Equip the battle rifle and upgrade it to equip it with a silence and kill enemies untill challenge is complete.

31- Amputation: Remove 20 limbs from xenos using the Tactical Shotgun
Same area as 25, I found the easiest way is to stun the alien with RB and then aim for a leg or arm, does not always work, continue on killing aliens and trying to aim for legs and arms, if you get to the lift, run out of ammo or die simply reload checkpoint and repeat untill challenge is complete.

32- Stand Your Ground: Make the killing shot on a crusher using the Service Pistol
This is hard and will take multiple tries. Load up Mission 9 until after you defend the cargo bay with the sentry turret and the ammo cache. Afterwards you will encounter the huge crusher, which has a ton of health. The frustrating thing about this will be that O'neal will be firing his Smart Gun so actually getting the last hit is hard. You can try to glitch him by jumping on the incline to the left but that takes a long time to get his health down. I used extended mags on the pulse rifle and unloaded a full 300 bullets on him then started shooting at him with the Service Pistol. He will die soon, just hope that it's by your bullet. It helps to have to regular fire rate and not the increase damage that slows the rate of fire down. (Submitted by shredsector)

This is much easier in a private match, TDM, Last hope map, Find the APC in the centre of the map, the crusher spawn points are at either end of the corridor with the apc, the spawn points look like alien hive sections.
You can spawn the crusher twice per round once around 3:00min mark and 2nd around the 1:00min remaining mark.
Have a friend spawn the crusher and make sure you get the kill shot with the service pistol.
If your friend does not damage you and you dont already have the cheevo you should recieve the anytime,anywhere cheevo.


33- Combined Arms: Use the Combat Pistol to kill 10 enemies that were on fire
Easiest to use your Assault Rifle flame thrower to just light up any xeno and switch to your Combat Pistol. They do not have to be ON fire as they die, only at one point. Using extended mags and full auto for the pistol help but are not necessary. (Submitted by shredsector)

Combined arms you can also use firebomb grenades & firebomb launcher on the pulse rifle i did this on mission 2 in fact i done challenges 33 to 37 on mission 2 right at the start of the level. (Submitted by Goggs25)

34- Feel The Burn: Kill 20 enemies using firebombs
Load up mission 3, Press and hold Y and left on the left stick, now select U4 firebombs. Now kill as many enemies as you can untill either they all dead or you run out of ammo and reload checkpoint until challenge is complete.

35- Assault With Intent: Kill 20 enemies using the Assault Rifles primary fire
Load up any mission, press and hold Y and up on left stick, select the assault riffle and just play until you get 20 kills, i believe it can also be done in multiplayer.

36- Light Em Up: Kill 20 enemies using the Assault Rifles Underslung Flamethrower
Same as 35 but this time press pause and go into your asenal upgrades, assault rifle and select the flame thrower as the attachment and get 20 kills, misson 3 is good place to do this as you can abuse the reload checkpoint.

37- Shock Trooper: Kill 20 enemies that were stunned using the Tactical Shotguns Arc Rounds
Same as campaign 6 Double tap, but this time you must kill 20 enemies, Ensure you have arc rounds as a secondary attachment through the arsenal upgrades and press RB to stun an enemy and then RT to kill them.

Campaign Challenges:

1- Solid Legs: Complete a campaign mission on any difficulty
-Easy enough. Just like it says.

2- Splattered: Gib 5 enemies in a single campaign mission
-Use your secondary fire grenade launchers and splatter some xenos. The default ones on the Pulse Rifle and Pump Shotgun work great.

3- Better Than Harsh Language: Kill 5 enemies with melee in a single campaign mission
-Melee 5 enemies to death until you get this.

4- Nice Groupings: Kill 2 enemies with a single shot from the Pump Shotgun
-When you've got 2 enemies close to each other and pretty much right in front of you, kill them both with one shot. Might require some luck.

5- Tactical Supremacy: Kill 6 enemies with Tactical weapons in a campaign mission
-This was very confusing when I did it as I thought it meant the tactical shotgun but what it refers to are your firebombs, grenades, and claymores. Hold Y and push your left stick to the left to equip different ones and get 6 kills in one mission. Use left on the D-Pad to bring them out and RT to throw/place.

6- Double Tap: Kill 2 enemies that are stunned in a campaign mission
-Use the Tactical Shotguns secondary fire to stun and then finish them off.

7- Bug Hunter: Kill 5 facehuggers
-These are the annoying little scorpion-like things that jump on your face. They appear as early as Mission 2 but there are also a ton at the start of the second to last mission after you pick up the flamethrower.

8 -Sawbones: Remove a total of 20 limbs from xenomorphs
-This can take time if you're just firing at their center of mass. It's best to just aim for their legs and you will get this eventually. Rifles and shotguns are both fine.

9- Iron Fist: Kill 10 enemies with melee in a single campaign mission without dying
-This can be tricky if there are human enemies around firing at you and also with your partners shooting everything. It's best done on recruit on the first mission after rescuing Keyes. Keyes will cut open a door and you will be on your way to retrieve a Flight Rec. There are some easy xenos here to melee and just reload the checkpoint until you have 10, as long as you don't die.

10- Superior Firepower: Kill 2 enemies with the Smart Gun, Flamethrower or RPG in a campaign mission
-Smart gun is in Mission 4 but the fastest way to get this is the start of the second to last mission. Just run to the door and cut it open. You'll find a flamethrower soon on your left and keep going past the cocooned scientists to start burning away. Also the area with a lot of facehuggers.

Beginning of mission 3 just before the 1st set of enemies is a armory door that has a flame thrower too. (Submitted by Devious jedi)

11-Inside Out: Kill 5 enemies with explosives in a campaign mission
-These can be with grenades or launchers. Just blow up 5.

12- Battle Hardened: Complete a campaign mission on Hardened or higher difficulty

13- Ultimate Badass: Complete a campaign mission on Ultimate Badass
-For the last 2 challenges just play the last level as it's easy and relatively quick.

Multiplayer Challenges:
All of these challenges can be boosted in private matches

1- Mutation: Purchase a Xeno combat upgrade
You must play a MP game or 2 in order to get your alien up to rank 2. Now from main menu select VERSUS - EDIT LOADOUT - XENO LOADOUT. Now spend your point upgrading anything that has become unlocked, i did the secondary attack "whirlwhind" on the soldier xeno.

2- Eggstermination: Win an Extermination mode match,
From main menu select VERSUS - EXTERMINATION and win the match. might take you a few tries but keep at it. You do not have to be top of the leaderboard, just be on the winning team.

3- Survivalist: Win a Survivor mode match
From main menu select VERSUS - SURVIVOR and win the match, may take a few games but keep at it.You do not have to be top of the leaderboard, just be on the winning team.

4- Escape Artist: Win an Escape mode match
From main menu select VERSUS - ESCAPE and win the match, may take a few tries but keep at it. You do not have to be top of the leaderboard, just be on the winning team.

For this you can set up a private match and start it with just your self in the lobby. As marine run to all the markers on your way to escape, then once the next round starts just sit there as the alien untill the 15 min timer runs down (Submitted by x PAYLOAD x)

5- Victorious: Kill 25 enemies in Team Death Match
From main menu select VERSUS - TEAM DEATHMATCH, Just get 25 kills overall, does NOT have to be in 1 game so this will come with time. Marine and alien kills both count.

6- Raking Claws: As a Soldier Xeno, kill 10 enemies with Quick Strike
As a soldier alien kill enemies with RT primary attack, make sure it is quick strike and that you have not upgrade the primary attack or if you have just reselect quick strike as your primary attack.

7- Spit In Your Eye: As a Spitter Xeno, kill 10 enemies with Acid Spit
As xeno spitter class kill enemies using RT primary attack. ensure that you havnt upgraded the primary attack or just reselect the spit attack.

8- Cat-Like Reflexes: As a Lurker Xeno, pounce on three enemies in less than 10 seconds
Easiest done in private match, Select the lurker alien when you spawn, Get 3 buddies as marines to line up in front of you with roughly 4-5 meter gap between them. Now press RT to perform a pounce, you should jump on the marine and hit him once or twice, quickly do the same to the 2nd marine and then the 3rd and challenge should complete

Equip the speed pounce (RB) in your Lurker's loadout and you can use this 3 times on the SAME enemy. I did it in a public match to the same guy (after the initial pounce, I took a step back and waited for him to get back to his feet and pounced on him again, repeated and got the challenge on the third pounce) but from the previous solutions it should work in a private match as well. (Submitted by Hordesman)

9- Heads Up: As a Xeno, kill an enemy from the wall or ceiling
As a soldier class press and hold LT to climb on a wall or ceiling and then press RT to perform a primary attack, should be some kind of tail whip, if you kill the marines the challenge completes

You can get this as the Spitter using the Primary "spit" attack (RT). Find a wall or ceiling (I did this from a wall) overlooking the enemy and climb up it using LT. While still holding LT, Spit on an enemy twice using RT.. Netted it in a public match but should work in a private one (Submitted by Hordesman)

10- Sentry Duty: Destroy 5 Sentry turrets
This can be done in survivor mode (condemned) and much easier done in a private match. You must be the aliens, allow the marines to set up the sentry gun preferably facing a wall and let the alien destroy it, now its quicker to kill the marines and end the match. This can be done over multiple matches.
Its would also be preferable to do this as 1 vs 1 and both be on same challenge as you can take it in turns.

11- Two Birds: Kill two enemies with one shotgun blast
Now when my boosting group tryed this it seems a little glitchy, we found that if you get 2/3 aliens close together, equip hicks shot gun and quickly blast all 3 aliens, preferably 1 blast to each head and the challenge appears to accept this. None of the peeps i played with got 2 kills with 1 shot but all completed the challenge following this method.

Also you can get a double kill, upgrade your pump action, get 2 xenos to spawn as lurker xenos, shoot both in the head 3 times with a pistol and then pull out your pump action stand back a little and aim just between their heads and blast away.

12- Scout: Track 50 Xenos on the Motion Tracker
As a marine in any versus game type, press LB to bring up your motion tracker. After you have tracked 50 xenos the challenge will be done, this can be done over multiple matches and will come in time.
The 50 does not have to be 50 diffrent xenos, i did this on the same xeno and the challenge counts the blips, just keep the xeno moving so the distance changes and you will prob get this in one match

13- Blunt Force: As a Soldier Xeno, kill 10 enemies with Heavy Strike
After you rank up your xeno class a bit, spend a point and upgrade the soldiers primary attack to heavy strike and then kill 10 enemies in any gametype, can also be done over multiple matches.

14- Hawked It All Up: As a Spitter Xeno, kill 2 enemies at once with a single fully charged Spit attack
Easiest done in a private match, select the spitter class xeno and get 2/3 marines to crouch down together in a corner, now press and hold RT untill your spit attack is fully charged and unleash it, you should kill atleast 2 if not all 3 marines and complete the challenge.
If you struggle to get the double kill try to reduce the marines health with 2/3 melee strikes then use the spit attack.

15- Ricochet: As a Spitter Xeno, kill 10 enemies with Acid Rebound
This requires your alien to be rank 16, Spend an unlock point and equip your xeno spitter with acid rebound primary attack and kill 10 enemies.

16- Kill Em While They're Down: As a Lurker Xeno, kill an enemy after knocking them down with Speed Pounce
This requires your alien to be rank 14, spend an unlock point and equip the speed pounce as secondary attack for your xeno lurker. Approach a marine and press RB to speed pounce and while they are down attack with RT and kill them.

17- Fire In The Hole: As a Marine, kill 25 Xenos using the Smart Gun, Flamethrower or RPG
On any map/gamemode as a marine find and equip any of the above weapons and get 25 kills, kills are accumalitive so feel free to get them over several games. Also i belive that the kills can be a mix of any of the 3 weapons, can anyone confirm this?

18- Berserker: As a Soldier Xeno, kill 10 enemies with Flurry
Rank up your alien sufficiently to unlock the flurry primary attack, equip it to your xeno soldier and get 10 kills.

19- Stepped In It: As a Spitter Xeno, kill 5 enemies with Acid Trap
Rank up your alien sufficiently to unlock the acid trap primary attack, equip it to your xeno spitter and get 5 kills, either lay the traps 2-3 together on the ground near objectives or just hit the enemies with them untill they die. These acid traps are similar to marine mines.

20- Shock And Awe: As a Lurker Xeno, hit 2 enemies with a single Shockwave Pounce attack
Easiest done in a private match. Rank up your alien sufficiently to unlock the shockwave secondary attack and equip it to your xeno lurker. Now get 2/3 friends as marines to stand close together, press RB to pounce on them with the shockwave, if you hit 2 together and preferably them 2 die the challenge is
complete.

21- Hard Boiled: As a Marine, kill 5 Xeno Boilers during a multiplayer match

TDM Origin has 2 boiler spawn points and if boosted you should be able to get 2-3 boilers per round, spawn points are one on white building in center of map, the building has a "2" on it. 2nd spawn point is on some red shipping crates. Get your bud in a private match and when available spawn the boiler and kill him, try to get as many as you can in the round and in the next round do the same for your bud.
The 5 kill are accumalitive so they despite the description they DO NOT have to be done in 1 match.

For Uncrushable and Hard Boiled...
They spawn on all maps I believe both for TDM and Extermination. These challenges should be boosted. The main boosting map is The Hive so I will just describe the locations for them here.

At about the 4:00 remaining mark there is a boiler spawn husk at the very top level (from the center pit keep going up and look around the catwalks.) It will not always spawn but sometimes it will be there. There might be a second husk somewhere but after playing through many times to get through this achievement I have yet to find one.

At around the 3:00 remaining mark there will probably be a crusher spawn in one of two locations. The crusher spawns are the large growths on the walls and will sort of glow yellow. Pressing X will activate it. Both spawns are on the bottom floor, one sort of near the pit and another on the other side. Once you figure it out they will be there. These spawn locations do not change, however the appearance probability at each location will.

There seems to always be 2 upgrades per round (whether crusher or boiler) so keep that in mind. A new one will not spawn unless there is 1:00 in between. It seems that if you do get let's say a crusher in the first round, it will not be possible to get it from the same spot in the second because the hole in the wall is still there, so I would advise to restart your games after one round(Submitted by shredsector)

22- Extended Reach: As a Lurker Xeno, kill 5 enemies using Lunging Strike
Rank up your alien suffieciently enough to unlock the lunging strike attack and equip it to your lurker xeno. Now kill 5 enemies using the lunging strike attack.

23- Liquefy: Kill 8 enemies with acid damage
Any acid kill count towards this challenge but the easiest way to do this is to equip the rupture mutation and suicide the enemy, when they kill you, you will explode and kill the marines with acid.
Also if you do a private match and your the only alien with 2-3 marines, get them all to stand very close to you and kill you and your acid explosion should kill all marines and complete the challenge in 1 round.

24- Mercy Killer: Use the Combat Pistol to kill 5 enemies that were covered in fire
You will want the following loadout, Assault Rifle with the flamethrower upgrade and the combat pistol (Hight rate of fire upgrade helps). You just need to use the Flamethrower on someone and quickly press right on the D-Pad to change to the Combat Pistol and finish them. You need to be the one who sets him/she on fire as it does not count if your team mate had done it. Submitted by x PAYLOAD x)

Can be boosted 1 Vs 1 in private

25- Left A Mark: As a Spitter Xeno, kill 10 enemies with Acid Strike
Rank up your alien sufficiently to unlock the acid strike attack and equip it to your xeno spitter, now use the secondary attack to kill 10 enemies.

26- Trap Sprung: As a Marine, kill 25 Xenos using Claymore mines
As a marine equip claymores to your tactical slot and in any gamemode try to set them up near corners or on objectives, get 25kills over multiple matches to complete the challege.
The fastest way to do this is in a full lobby private match, get the alien team to all stand together, set the claymore up in front of them and BOOM, plenty of kills, repeat until challenge is complete.
There is also a great idea in the comments section by "Your skill died" on how to get this in 1v1 in 2 matches. If anyone else can confirm his idea works well I will add it to this guide.

27- Flurry Finish: As a Lurker Xeno, kill an enemy with Flurry after a Speed Pounce
Equip flurry and speed pounce to your xeno lurkers primary and seconday attacks. Now find a marine and speed pounce onto them which should knock them to the floor, now finish them with a flurry attack.

28- Sliced And Diced: As a Soldier Xeno, kill 2 enemies with a single Whirlwind attack
Easiest done in private match. Equip the whirlwind attack to your xeno soldier seconday attack. Get 2 marines and melee them twice to reduce their health, now get them to stand close together and use whirlwind to kill both marines.

29- Uncrushable: As a Marine, kill 5 Xeno Crushers during a multiplayer match
This is much easier in a private match, TDM, Last hope map, Find the APC in the centre of the map, the crusher spawn points are at either end of the corridor with the apc, the spawn points look like alien hive sections.
You can spawn the crusher twice per round once around 3:00min mark and 2nd around the 1:00min remaining mark.
Have a friend spawn the crusher and make sure you get the kill shot with the service pistol. Working in a 1vs1 this should only take 2 matches to complete.
The 5 kill are accumalitive so they despite the description they DO NOT have to be done in 1 match.

30- Acid Bath: As a Spitter Xeno, kill 10 enemies with Rupture Mutation
Rank up your alien sufficiently to unlock the Rupture mutation and equip it to your spitter xeno. Now run up to the enemy and when they kill you, you will explode and if your acid blood should kill the enemy, repeat 9 more times.

31- Free Hugs: As a Lurker Xeno, kill 20 enemies using the Pounce attack
Spawn as the lurker xeno and press RB to pounce on an enemy, you should jump on them and hit them a few times causing them to die, repeat 19 more times.

32- Easy Prey: As a Soldier Xeno, kill an enemy after stunning them with Bludgeon
Rank up your alien sufficiently to unlock the Bludgeon attack, find an enemy an bludgeon them which should knock them to the ground, now attack and kill them.

33- From The Shadows: As a Lurker Xeno, kill 5 enemies without taking any damage
Spawn as a lurker xeno and get 5 kills without taking any damage, this means trying to sneak up on a marine and kill them without being shot, easier done in a private match, i believe these can be done over multiple matches.

34- Alpha: As a Xenomorph, kill 5 Marines without dying
Not as easy as the marine one but still possible in public match, try to get the crusher and kill as many as you can, easier to do in a private match.

35- Ace: As a Marine, kill 5 Xenos without dying
Simple enough, get 5 kills in a row without dying, easily done in public matches, utilise the grenade launcher, shot gun for close range, even easier if boosted in a private match.

36- Hard To Kill: Completed an Escape Match without being incapacitated
You can use the same guide as challenge 4 for challenge 36 - Hard To Kill: Completed an Escape Match without being incapacitated. Just tried challenge 4 solution on Challenge 36 and i can confirm it works :)(Submitted by x PAYLOAD x)

This cheevo will be awarded for completion of all the challenges.

There are 86 challenges in total through 3 catagories, Marine, Campaign & Multiplayer.
You can only work on 1 challenge per catagory at a time so at all times you will have 3 active challenges.
Unfortunatly the game wont allow you to complete challenges in any order you want, they have to be done in a set order.
Luckily all challenges can either be done through the main campaign or in private multiplayer matches.

Here i will list each challenge and try to describe the easiest way to complete it.
If anyone has any easier ways please feel free to comment and i will include it and give credit where required.

Please also check the comments for various other ways the awesome TA community have found to complete these challenges and if you have left a comment and i have not put it in the guide im sorry but i obviously cant add everything but your advice is still greatly appreciated

Thanks and credit to Hordesman, shredsector, Goggs25, x PAYLOAD x, scuzzybunny,Xx SpazemxX, MunknDrunky79, Meszerus for their input.

BIG thank you to "shredsector" who has given me permission to use his guides for the campaign related challenges so head over to his solution and give him a thumbs up.


Marine Challenges:

1- Field Modified: Purchase a Marine weapon upgrade
Once you level you marine to level 2, press start and select arsenal upgrades, a weapon will be highlighted so select it and spend a point to upgrade.

2- Spray N' Pray: Kill 5 enemies with hip fire
Simple enough, just kill enemies without using LT to sight up.

3- Two For One: Kill two enemies with one shot from an Underslung Grenade Launcher
You can use any rifle as long as you select the grenade launcher attachment, select mission 1 and after you rescue keys and grab the flight recorder you will go through some corridors, just before you get into the lift there will be lots of aliens grouped together. If you dont complete the challenge just restart checkpoint and try again.

4- Boom Stick: Kill 20 enemies using the Pump Shotguns primary fire
Press and hold Y, Select secondary weapon and then choose pump action shotgun. Get 20 kills. As far as i am aware using hicks shotgun does NOT count towards this.

5- Big Fucking Signal: Track 5 xenos at once on your Motion Tracker
Select mission 1, after rescuing keys and grabbing the flight recorder, just before you get in the lift there will be far more than 5 aliens chasing you, dont kill any and press LB to pull up your motion tracker.

6- Heavily Armed: Kill 7 enemies using a primary weapons alternate fire
Simple enough, on any mission use any rifle or shotgun and press RB to kill enemies, obviously using grenade launchers on the rifles is easiest way to go.

7- Kill Or Be Killed: Kill 20 enemies with any rifles primary fire
Make sure you use any of the 3 rifles and just kill enemies untill challenge complete. Mission 2 is good place to farm this cheevo, kill all enemies at the starting area and reload checkpoint.

8- Straight Shooter: Get 10 headshots using the Service Pistol
Make sure you select the service pistol and not gormans pistol. Load up any mission and get 10 head shots, aliens and humans count and it does not have to be in a row.

9- Airtime: Kill 20 enemies that are climbing on the walls or ceiling
Load up mission 1 and again just before you get into the elevator the aliens will come down the corridor, they will be all over the walls and ceiling, reload the checkpoint and repeat untill challenge complete.

10- Pop Goes The Melon: Get 10 headshots on xenos with any rifle
Load up any mission that has an abundance of aliens and simply aim for the head.

11- Short, Controlled Bursts: Do not miss an enemy with any bullets from a full rifle mag
This is a pain in the butt hole to do in campaign, the bullet registration is awful. It can be done and take your time and make sure you get a hit with each round. You will know when a hit has registered as a small red X will flash up.
Use the battle rifle as it is single shot and only has a 15 round magazine, best done in private MP match. As a marine get a friend as an alien to find you and shoot them twice, let them regenerate health and repeat.
If your fortunate enough to have the DLC plasma pulse rifle this is much easier as it has a 4 round mag, Thanks to Xx SpazemxX & scuzzybunny

When you have to survive against the queen on second to last level go into the container with the armour and ammo and she will stand outside with her head down very easy to get on that fight if you have no mp partner. You could do the pistol one here too (Submitted by MunknDrunky79)

12- Sharp Shooter: Kill 20 enemies that are 15m away or farther, using the Battle Rifle
Make sure to select the battle rifle, Load up mission 2 and when you see an enemy back away as far as you can and kill them. Reload checkpoint and repeat.
I suggest level 7 (One Bullet). Shortly after you see the first and second spotlights, and your character comments, "They sealed it up. No Xeno can get through, they're not that stupid," you enter a small room which takes you immediately back outside. This outside portion is a rather long straight stretch. Once Bella and O'Neil move into the area, Xeno's will pounce in at varying parts of the land stretch. Position yourself at the top of the stairs in the small room, back up enough so you can make a little more distance, and shoot the Xeno's from here with your battle rifle. When they stop spawning, move out of the door yourself so more spawn, then back up and repeat for another 4-6 Xeno's. Reload this checkpoint (which is super awesomely at the bottom of the stairs) to repeat. (Submitted by Meszerus)

13- Trapper: Kill 20 enemies with Battle Rifle Mines
Make sure you select battle rifle and from the aresenal upgrade select Proc-mine launcher (alternate fire). Again load up mission 2 and use RB to kill enemies, if you run out of ammo or enemies simply reload checkpoint and repeat.

14- Second To None: Kill 15 enemies with any side arm
Again mission 2, press right on the D-pad to select side arm and kill all enemies, reload checkpoint and repeat.

15- Carry A Big Stick: Kill 3 enemies with a primary weapons alternate fire without dying
Follow same as 13 - Trapper and this is easily done.

16- Back On Your Feet: Revive 5 other players in Coop Campaign or Versus Matches
This will either come naturally through MP or coop but if you wanna get it done easily, grab a 2nd controller, sign in a guest profile and load up any mission on badass difficulty. Have player 2 stand still while P1 shoots and downs P2, now stand next to the downed friendly and hit X to revive, Repeat 4 more times and challenge complete. (1st time should net you a cheevo if you aint already got it)

17- Equal Opportunity: Kill 20 enemies using the Combat Pistol
On any mission, Press and hold Y, select combat pistol and kill 20 enemies.

18- Set Em Up, Knock Em Down: Kill 10 enemies with Claymores, Mine Launcher Mines or Acid Traps
Follow same as 13 - Trapper and this is easily done.

19- Spread The Love: Kill 2 enemies within 10 seconds using the SMG
Load up mission 2, Select the SMG as a primary weapon and kill the 1st 2 enemies that come through the door.

20- Xenophobia: Kill 10 Soldier, 10 Lurker or 10 Spitter xenos
Mission 1, After rescuing keyes just kill aliens until challenge complete, You only need 10 of 1type, Not 10 of each.

21- Blown To Hell: Kill 20 enemies using the Assault Rifles Grenade Launcher
Select the assault rifle with grenade launcher attachment. Mission 2, kill all enemies with RB when you run out of enemies or ammo reload checkpoint and repeat

22- Make It Count: Shoot enemies with an entire clip using the Service Pistol without missing or reloading
Can be done in campaign but again easier if you follow 11- Short, Controlled Bursts. I did this on mission 2, press LT and make sure every shot hits the target, ALOT easier that 11- Short, Controlled Bursts though

23- Down But Not Out: Kill an enemy while incapacitated
Grab a 2nd controller and sign in a guest, load up mission 2 and run to the 1st 2 enemies that come through the door, allow them to down you and then while you are down use the pistol to kill one of them.

24- Amateur Surgeon: Decapitate a xenomorph
I did this as i rescue keyes, i had pump action shotgun, when i got to keyes i can see the alien in the wall, i shot it and it jumped down at me, when it was on the floor it was crouched down showing me only it's head so i fired and BOOM head shot and decapitation.
Im sure this is also possible using the battle rifle and getting head shots

25- Flash Fire: Kill 2 enemies with fire damage within 10 seconds
Load up mission 1, equip the fire bombs as your tactical. When you get to the corridor just before the lift you will be attacked by multiple aliens so throw you fire bomb and carnage ensues, challenge complete.

26- Judge, Jury And Executioner: Execute 20 enemies using the Pulse Rifles primary fire
Same area as 25, Simply equip your pulse rifle and kill as many enemies as you can, reload or die and repeat untill challenge is complete.

27- Shotty Workmanship: Kill 20 enemies using the Tactical Shotguns primary fire
Same area as 25, Equip the tactical shotgun, possibly upgrade the magazine for fast reloads if you want and kill all the aliens, reload checkpoint and repeat until challenge complete.

28- Keep Up The Fire: Kill 6 enemies in under 60 seconds using the SMG
Same area as 25, Equip the SMG and upgrade the magazine size if you want to, as soon as you hit the corridor this is when you should start using the SMG, there are way more than 6 aliens to get the challenge and the 60secs is plenty of time.

29- Reflex Action: Kill 5 xenomorphs that are inside a vent using the Pump Shotgun
Mission 1, after you retrieve the flight recorder equip your shotgun, The next couple of aliens will come out of windows and vents and if your quick enough to kill them it will count towards this challenge. When you get to the corridor just before the lift an alien will come from the ceiling, kill it quickly and reload checkpoint and repeat untill complete.

30- The Silent Killer: Kill 5 enemies using a suppressor on the Battle Rifle
Same area as 25. Equip the battle rifle and upgrade it to equip it with a silence and kill enemies untill challenge is complete.

31- Amputation: Remove 20 limbs from xenos using the Tactical Shotgun
Same area as 25, I found the easiest way is to stun the alien with RB and then aim for a leg or arm, does not always work, continue on killing aliens and trying to aim for legs and arms, if you get to the lift, run out of ammo or die simply reload checkpoint and repeat untill challenge is complete.

32- Stand Your Ground: Make the killing shot on a crusher using the Service Pistol
This is hard and will take multiple tries. Load up Mission 9 until after you defend the cargo bay with the sentry turret and the ammo cache. Afterwards you will encounter the huge crusher, which has a ton of health. The frustrating thing about this will be that O'neal will be firing his Smart Gun so actually getting the last hit is hard. You can try to glitch him by jumping on the incline to the left but that takes a long time to get his health down. I used extended mags on the pulse rifle and unloaded a full 300 bullets on him then started shooting at him with the Service Pistol. He will die soon, just hope that it's by your bullet. It helps to have to regular fire rate and not the increase damage that slows the rate of fire down. (Submitted by shredsector)

This is much easier in a private match, TDM, Last hope map, Find the APC in the centre of the map, the crusher spawn points are at either end of the corridor with the apc, the spawn points look like alien hive sections.
You can spawn the crusher twice per round once around 3:00min mark and 2nd around the 1:00min remaining mark.
Have a friend spawn the crusher and make sure you get the kill shot with the service pistol.
If your friend does not damage you and you dont already have the cheevo you should recieve the anytime,anywhere cheevo.


33- Combined Arms: Use the Combat Pistol to kill 10 enemies that were on fire
Easiest to use your Assault Rifle flame thrower to just light up any xeno and switch to your Combat Pistol. They do not have to be ON fire as they die, only at one point. Using extended mags and full auto for the pistol help but are not necessary. (Submitted by shredsector)

Combined arms you can also use firebomb grenades & firebomb launcher on the pulse rifle i did this on mission 2 in fact i done challenges 33 to 37 on mission 2 right at the start of the level. (Submitted by Goggs25)

34- Feel The Burn: Kill 20 enemies using firebombs
Load up mission 3, Press and hold Y and left on the left stick, now select U4 firebombs. Now kill as many enemies as you can untill either they all dead or you run out of ammo and reload checkpoint until challenge is complete.

35- Assault With Intent: Kill 20 enemies using the Assault Rifles primary fire
Load up any mission, press and hold Y and up on left stick, select the assault riffle and just play until you get 20 kills, i believe it can also be done in multiplayer.

36- Light Em Up: Kill 20 enemies using the Assault Rifles Underslung Flamethrower
Same as 35 but this time press pause and go into your asenal upgrades, assault rifle and select the flame thrower as the attachment and get 20 kills, misson 3 is good place to do this as you can abuse the reload checkpoint.

37- Shock Trooper: Kill 20 enemies that were stunned using the Tactical Shotguns Arc Rounds
Same as campaign 6 Double tap, but this time you must kill 20 enemies, Ensure you have arc rounds as a secondary attachment through the arsenal upgrades and press RB to stun an enemy and then RT to kill them.

Campaign Challenges:

1- Solid Legs: Complete a campaign mission on any difficulty
-Easy enough. Just like it says.

2- Splattered: Gib 5 enemies in a single campaign mission
-Use your secondary fire grenade launchers and splatter some xenos. The default ones on the Pulse Rifle and Pump Shotgun work great.

3- Better Than Harsh Language: Kill 5 enemies with melee in a single campaign mission
-Melee 5 enemies to death until you get this.

4- Nice Groupings: Kill 2 enemies with a single shot from the Pump Shotgun
-When you've got 2 enemies close to each other and pretty much right in front of you, kill them both with one shot. Might require some luck.

5- Tactical Supremacy: Kill 6 enemies with Tactical weapons in a campaign mission
-This was very confusing when I did it as I thought it meant the tactical shotgun but what it refers to are your firebombs, grenades, and claymores. Hold Y and push your left stick to the left to equip different ones and get 6 kills in one mission. Use left on the D-Pad to bring them out and RT to throw/place.

6- Double Tap: Kill 2 enemies that are stunned in a campaign mission
-Use the Tactical Shotguns secondary fire to stun and then finish them off.

7- Bug Hunter: Kill 5 facehuggers
-These are the annoying little scorpion-like things that jump on your face. They appear as early as Mission 2 but there are also a ton at the start of the second to last mission after you pick up the flamethrower.

8 -Sawbones: Remove a total of 20 limbs from xenomorphs
-This can take time if you're just firing at their center of mass. It's best to just aim for their legs and you will get this eventually. Rifles and shotguns are both fine.

9- Iron Fist: Kill 10 enemies with melee in a single campaign mission without dying
-This can be tricky if there are human enemies around firing at you and also with your partners shooting everything. It's best done on recruit on the first mission after rescuing Keyes. Keyes will cut open a door and you will be on your way to retrieve a Flight Rec. There are some easy xenos here to melee and just reload the checkpoint until you have 10, as long as you don't die.

10- Superior Firepower: Kill 2 enemies with the Smart Gun, Flamethrower or RPG in a campaign mission
-Smart gun is in Mission 4 but the fastest way to get this is the start of the second to last mission. Just run to the door and cut it open. You'll find a flamethrower soon on your left and keep going past the cocooned scientists to start burning away. Also the area with a lot of facehuggers.

Beginning of mission 3 just before the 1st set of enemies is a armory door that has a flame thrower too. (Submitted by Devious jedi)

11-Inside Out: Kill 5 enemies with explosives in a campaign mission
-These can be with grenades or launchers. Just blow up 5.

12- Battle Hardened: Complete a campaign mission on Hardened or higher difficulty

13- Ultimate Badass: Complete a campaign mission on Ultimate Badass
-For the last 2 challenges just play the last level as it's easy and relatively quick.

Multiplayer Challenges:
All of these challenges can be boosted in private matches

1- Mutation: Purchase a Xeno combat upgrade
You must play a MP game or 2 in order to get your alien up to rank 2. Now from main menu select VERSUS - EDIT LOADOUT - XENO LOADOUT. Now spend your point upgrading anything that has become unlocked, i did the secondary attack "whirlwhind" on the soldier xeno.

2- Eggstermination: Win an Extermination mode match,
From main menu select VERSUS - EXTERMINATION and win the match. might take you a few tries but keep at it. You do not have to be top of the leaderboard, just be on the winning team.

3- Survivalist: Win a Survivor mode match
From main menu select VERSUS - SURVIVOR and win the match, may take a few games but keep at it.You do not have to be top of the leaderboard, just be on the winning team.

4- Escape Artist: Win an Escape mode match
From main menu select VERSUS - ESCAPE and win the match, may take a few tries but keep at it. You do not have to be top of the leaderboard, just be on the winning team.

For this you can set up a private match and start it with just your self in the lobby. As marine run to all the markers on your way to escape, then once the next round starts just sit there as the alien untill the 15 min timer runs down (Submitted by x PAYLOAD x)

5- Victorious: Kill 25 enemies in Team Death Match
From main menu select VERSUS - TEAM DEATHMATCH, Just get 25 kills overall, does NOT have to be in 1 game so this will come with time. Marine and alien kills both count.

6- Raking Claws: As a Soldier Xeno, kill 10 enemies with Quick Strike
As a soldier alien kill enemies with RT primary attack, make sure it is quick strike and that you have not upgrade the primary attack or if you have just reselect quick strike as your primary attack.

7- Spit In Your Eye: As a Spitter Xeno, kill 10 enemies with Acid Spit
As xeno spitter class kill enemies using RT primary attack. ensure that you havnt upgraded the primary attack or just reselect the spit attack.

8- Cat-Like Reflexes: As a Lurker Xeno, pounce on three enemies in less than 10 seconds
Easiest done in private match, Select the lurker alien when you spawn, Get 3 buddies as marines to line up in front of you with roughly 4-5 meter gap between them. Now press RT to perform a pounce, you should jump on the marine and hit him once or twice, quickly do the same to the 2nd marine and then the 3rd and challenge should complete

Equip the speed pounce (RB) in your Lurker's loadout and you can use this 3 times on the SAME enemy. I did it in a public match to the same guy (after the initial pounce, I took a step back and waited for him to get back to his feet and pounced on him again, repeated and got the challenge on the third pounce) but from the previous solutions it should work in a private match as well. (Submitted by Hordesman)

9- Heads Up: As a Xeno, kill an enemy from the wall or ceiling
As a soldier class press and hold LT to climb on a wall or ceiling and then press RT to perform a primary attack, should be some kind of tail whip, if you kill the marines the challenge completes

You can get this as the Spitter using the Primary "spit" attack (RT). Find a wall or ceiling (I did this from a wall) overlooking the enemy and climb up it using LT. While still holding LT, Spit on an enemy twice using RT.. Netted it in a public match but should work in a private one (Submitted by Hordesman)

10- Sentry Duty: Destroy 5 Sentry turrets
This can be done in survivor mode (condemned) and much easier done in a private match. You must be the aliens, allow the marines to set up the sentry gun preferably facing a wall and let the alien destroy it, now its quicker to kill the marines and end the match. This can be done over multiple matches.
Its would also be preferable to do this as 1 vs 1 and both be on same challenge as you can take it in turns.

11- Two Birds: Kill two enemies with one shotgun blast
Now when my boosting group tryed this it seems a little glitchy, we found that if you get 2/3 aliens close together, equip hicks shot gun and quickly blast all 3 aliens, preferably 1 blast to each head and the challenge appears to accept this. None of the peeps i played with got 2 kills with 1 shot but all completed the challenge following this method.

Also you can get a double kill, upgrade your pump action, get 2 xenos to spawn as lurker xenos, shoot both in the head 3 times with a pistol and then pull out your pump action stand back a little and aim just between their heads and blast away.

12- Scout: Track 50 Xenos on the Motion Tracker
As a marine in any versus game type, press LB to bring up your motion tracker. After you have tracked 50 xenos the challenge will be done, this can be done over multiple matches and will come in time.
The 50 does not have to be 50 diffrent xenos, i did this on the same xeno and the challenge counts the blips, just keep the xeno moving so the distance changes and you will prob get this in one match

13- Blunt Force: As a Soldier Xeno, kill 10 enemies with Heavy Strike
After you rank up your xeno class a bit, spend a point and upgrade the soldiers primary attack to heavy strike and then kill 10 enemies in any gametype, can also be done over multiple matches.

14- Hawked It All Up: As a Spitter Xeno, kill 2 enemies at once with a single fully charged Spit attack
Easiest done in a private match, select the spitter class xeno and get 2/3 marines to crouch down together in a corner, now press and hold RT untill your spit attack is fully charged and unleash it, you should kill atleast 2 if not all 3 marines and complete the challenge.
If you struggle to get the double kill try to reduce the marines health with 2/3 melee strikes then use the spit attack.

15- Ricochet: As a Spitter Xeno, kill 10 enemies with Acid Rebound
This requires your alien to be rank 16, Spend an unlock point and equip your xeno spitter with acid rebound primary attack and kill 10 enemies.

16- Kill Em While They're Down: As a Lurker Xeno, kill an enemy after knocking them down with Speed Pounce
This requires your alien to be rank 14, spend an unlock point and equip the speed pounce as secondary attack for your xeno lurker. Approach a marine and press RB to speed pounce and while they are down attack with RT and kill them.

17- Fire In The Hole: As a Marine, kill 25 Xenos using the Smart Gun, Flamethrower or RPG
On any map/gamemode as a marine find and equip any of the above weapons and get 25 kills, kills are accumalitive so feel free to get them over several games. Also i belive that the kills can be a mix of any of the 3 weapons, can anyone confirm this?

18- Berserker: As a Soldier Xeno, kill 10 enemies with Flurry
Rank up your alien sufficiently to unlock the flurry primary attack, equip it to your xeno soldier and get 10 kills.

19- Stepped In It: As a Spitter Xeno, kill 5 enemies with Acid Trap
Rank up your alien sufficiently to unlock the acid trap primary attack, equip it to your xeno spitter and get 5 kills, either lay the traps 2-3 together on the ground near objectives or just hit the enemies with them untill they die. These acid traps are similar to marine mines.

20- Shock And Awe: As a Lurker Xeno, hit 2 enemies with a single Shockwave Pounce attack
Easiest done in a private match. Rank up your alien sufficiently to unlock the shockwave secondary attack and equip it to your xeno lurker. Now get 2/3 friends as marines to stand close together, press RB to pounce on them with the shockwave, if you hit 2 together and preferably them 2 die the challenge is
complete.

21- Hard Boiled: As a Marine, kill 5 Xeno Boilers during a multiplayer match

TDM Origin has 2 boiler spawn points and if boosted you should be able to get 2-3 boilers per round, spawn points are one on white building in center of map, the building has a "2" on it. 2nd spawn point is on some red shipping crates. Get your bud in a private match and when available spawn the boiler and kill him, try to get as many as you can in the round and in the next round do the same for your bud.
The 5 kill are accumalitive so they despite the description they DO NOT have to be done in 1 match.

For Uncrushable and Hard Boiled...
They spawn on all maps I believe both for TDM and Extermination. These challenges should be boosted. The main boosting map is The Hive so I will just describe the locations for them here.

At about the 4:00 remaining mark there is a boiler spawn husk at the very top level (from the center pit keep going up and look around the catwalks.) It will not always spawn but sometimes it will be there. There might be a second husk somewhere but after playing through many times to get through this achievement I have yet to find one.

At around the 3:00 remaining mark there will probably be a crusher spawn in one of two locations. The crusher spawns are the large growths on the walls and will sort of glow yellow. Pressing X will activate it. Both spawns are on the bottom floor, one sort of near the pit and another on the other side. Once you figure it out they will be there. These spawn locations do not change, however the appearance probability at each location will.

There seems to always be 2 upgrades per round (whether crusher or boiler) so keep that in mind. A new one will not spawn unless there is 1:00 in between. It seems that if you do get let's say a crusher in the first round, it will not be possible to get it from the same spot in the second because the hole in the wall is still there, so I would advise to restart your games after one round(Submitted by shredsector)

22- Extended Reach: As a Lurker Xeno, kill 5 enemies using Lunging Strike
Rank up your alien suffieciently enough to unlock the lunging strike attack and equip it to your lurker xeno. Now kill 5 enemies using the lunging strike attack.

23- Liquefy: Kill 8 enemies with acid damage
Any acid kill count towards this challenge but the easiest way to do this is to equip the rupture mutation and suicide the enemy, when they kill you, you will explode and kill the marines with acid.
Also if you do a private match and your the only alien with 2-3 marines, get them all to stand very close to you and kill you and your acid explosion should kill all marines and complete the challenge in 1 round.

24- Mercy Killer: Use the Combat Pistol to kill 5 enemies that were covered in fire
You will want the following loadout, Assault Rifle with the flamethrower upgrade and the combat pistol (Hight rate of fire upgrade helps). You just need to use the Flamethrower on someone and quickly press right on the D-Pad to change to the Combat Pistol and finish them. You need to be the one who sets him/she on fire as it does not count if your team mate had done it. Submitted by x PAYLOAD x)

Can be boosted 1 Vs 1 in private

25- Left A Mark: As a Spitter Xeno, kill 10 enemies with Acid Strike
Rank up your alien sufficiently to unlock the acid strike attack and equip it to your xeno spitter, now use the secondary attack to kill 10 enemies.

26- Trap Sprung: As a Marine, kill 25 Xenos using Claymore mines
As a marine equip claymores to your tactical slot and in any gamemode try to set them up near corners or on objectives, get 25kills over multiple matches to complete the challege.
The fastest way to do this is in a full lobby private match, get the alien team to all stand together, set the claymore up in front of them and BOOM, plenty of kills, repeat until challenge is complete.
There is also a great idea in the comments section by "Your skill died" on how to get this in 1v1 in 2 matches. If anyone else can confirm his idea works well I will add it to this guide.

27- Flurry Finish: As a Lurker Xeno, kill an enemy with Flurry after a Speed Pounce
Equip flurry and speed pounce to your xeno lurkers primary and seconday attacks. Now find a marine and speed pounce onto them which should knock them to the floor, now finish them with a flurry attack.

28- Sliced And Diced: As a Soldier Xeno, kill 2 enemies with a single Whirlwind attack
Easiest done in private match. Equip the whirlwind attack to your xeno soldier seconday attack. Get 2 marines and melee them twice to reduce their health, now get them to stand close together and use whirlwind to kill both marines.

29- Uncrushable: As a Marine, kill 5 Xeno Crushers during a multiplayer match
This is much easier in a private match, TDM, Last hope map, Find the APC in the centre of the map, the crusher spawn points are at either end of the corridor with the apc, the spawn points look like alien hive sections.
You can spawn the crusher twice per round once around 3:00min mark and 2nd around the 1:00min remaining mark.
Have a friend spawn the crusher and make sure you get the kill shot with the service pistol. Working in a 1vs1 this should only take 2 matches to complete.
The 5 kill are accumalitive so they despite the description they DO NOT have to be done in 1 match.

30- Acid Bath: As a Spitter Xeno, kill 10 enemies with Rupture Mutation
Rank up your alien sufficiently to unlock the Rupture mutation and equip it to your spitter xeno. Now run up to the enemy and when they kill you, you will explode and if your acid blood should kill the enemy, repeat 9 more times.

31- Free Hugs: As a Lurker Xeno, kill 20 enemies using the Pounce attack
Spawn as the lurker xeno and press RB to pounce on an enemy, you should jump on them and hit them a few times causing them to die, repeat 19 more times.

32- Easy Prey: As a Soldier Xeno, kill an enemy after stunning them with Bludgeon
Rank up your alien sufficiently to unlock the Bludgeon attack, find an enemy an bludgeon them which should knock them to the ground, now attack and kill them.

33- From The Shadows: As a Lurker Xeno, kill 5 enemies without taking any damage
Spawn as a lurker xeno and get 5 kills without taking any damage, this means trying to sneak up on a marine and kill them without being shot, easier done in a private match, i believe these can be done over multiple matches.

34- Alpha: As a Xenomorph, kill 5 Marines without dying
Not as easy as the marine one but still possible in public match, try to get the crusher and kill as many as you can, easier to do in a private match.

35- Ace: As a Marine, kill 5 Xenos without dying
Simple enough, get 5 kills in a row without dying, easily done in public matches, utilise the grenade launcher, shot gun for close range, even easier if boosted in a private match.

36- Hard To Kill: Completed an Escape Match without being incapacitated
You can use the same guide as challenge 4 for challenge 36 - Hard To Kill: Completed an Escape Match without being incapacitated. Just tried challenge 4 solution on Challenge 36 and i can confirm it works :)(Submitted by x PAYLOAD x)

This is an add-on solution to Devious Jedi's. I talked with him and he wasn't able to edit his in a good format any longer, so I am creating this to supplement his.

This covers alternatives to multiplayer challenge boosting, and only requires 1v1 for all of these. Due to this game having nearly nobody playing it anymore 1v1 is certainly easier to get than 1v2 by all means. This was done on 6/16/17 and 6/17/17, so no patches or game changes will affect these methods.

11- Two Birds: Kill two enemies with one shotgun blast
Load up the second campaign mission.
Have one partner use the tactical shotgun with stun rounds as the alt fire, and the other booster use a pump shotgun.
The booster with the tactical shotgun will stun the enemies as they enter the door, and the pump shotgun booster will line them up and shoot. If you shoot quickly enough 2 head shots will count.
This may take a little practice.

14- Hawked It All Up: As a Spitter Xeno, kill 2 enemies at once with a single fully charged Spit attack
Survival on Condemned.
The Xeno will have quick strikes as their RB attack.
The marine will set up a auto turret by the wall (facing the wall) and then move away from the turret.
The Xeno will strike the turret 7 times with a quick strike, and then move over to the marine and damage them till they are almost dead.
Then the marine will move over to stand directly next to the turret, and then crouch.
The Xeno will then spit a fully charged attack at the marine. The splash damage will destroy the turret and kill the marine in the same shot.

17- Fire In The Hole: As a Marine, kill 25 Xenos using the Smart Gun, Flamethrower or RPG
This can be done in the campaign.

20- Shock And Awe: As a Lurker Xeno, hit 2 enemies with a single Shockwave Pounce attack
Same setup as 14. No need to damage either the Marine or turret. Just use the Shockwave pounce once the Marine is standing directly next to the turret.

28- Sliced And Diced: As a Soldier Xeno, kill 2 enemies with a single Whirlwind attack
Exact same setup as 14. Follow the directions all the way through, but instead use Whirlwind to kill both turret and marine at the same time.
Additional note: You should hit the turret 7 times with the quick strike + 1 time Whirlwind move before you laid the final Whirlwind. Otherwise only the marine will die. Just 7 quick strikes not enough for that config.

This is an add-on solution to Devious Jedi's. I talked with him and he wasn't able to edit his in a good format any longer, so I am creating this to supplement his.

This covers alternatives to multiplayer challenge boosting, and only requires 1v1 for all of these. Due to this game having nearly nobody playing it anymore 1v1 is certainly easier to get than 1v2 by all means. This was done on 6/16/17 and 6/17/17, so no patches or game changes will affect these methods.

11- Two Birds: Kill two enemies with one shotgun blast
Load up the second campaign mission.
Have one partner use the tactical shotgun with stun rounds as the alt fire, and the other booster use a pump shotgun.
The booster with the tactical shotgun will stun the enemies as they enter the door, and the pump shotgun booster will line them up and shoot. If you shoot quickly enough 2 head shots will count.
This may take a little practice.

14- Hawked It All Up: As a Spitter Xeno, kill 2 enemies at once with a single fully charged Spit attack
Survival on Condemned.
The Xeno will have quick strikes as their RB attack.
The marine will set up a auto turret by the wall (facing the wall) and then move away from the turret.
The Xeno will strike the turret 7 times with a quick strike, and then move over to the marine and damage them till they are almost dead.
Then the marine will move over to stand directly next to the turret, and then crouch.
The Xeno will then spit a fully charged attack at the marine. The splash damage will destroy the turret and kill the marine in the same shot.

17- Fire In The Hole: As a Marine, kill 25 Xenos using the Smart Gun, Flamethrower or RPG
This can be done in the campaign.

20- Shock And Awe: As a Lurker Xeno, hit 2 enemies with a single Shockwave Pounce attack
Same setup as 14. No need to damage either the Marine or turret. Just use the Shockwave pounce once the Marine is standing directly next to the turret.

28- Sliced And Diced: As a Soldier Xeno, kill 2 enemies with a single Whirlwind attack
Exact same setup as 14. Follow the directions all the way through, but instead use Whirlwind to kill both turret and marine at the same time.
Additional note: You should hit the turret 7 times with the quick strike + 1 time Whirlwind move before you laid the final Whirlwind. Otherwise only the marine will die. Just 7 quick strikes not enough for that config.