Call of Duty: Ghosts

Me and a couple of mates worked tirelessly to figure out a path to make this easier. I'll try to share my path and what worked best for us. Hopefully it helps you.

We found that leaving the two generators inside to the right for last was generally a deathtrap so I'd strongly advise against this.

First of all we all used the relic "No Machines", It really doesn't do much to screw you over compared to the others. On top of that, we used three Medics and I was an Engineer (the 25 generator health and quicker generator repair helps a great deal.

You will want to complete the objectives as a priority as these are the only points you get. One should work Armor, one should work on Ammo (we used Armor-piercing) and one should work on Team Boosters. The last one should work on the Medic class as the regenerating health should help a bit.

After you've spent the first 4 points on your ability, proceed to just upgraded your class as you keep knocking off challenges. You should have enough to upgrade it to the second-to-last tier. If you complete every challenge you will have enough for the last one.

Make sure you start with the wide gate directly ahead and upon completing that make sure you all craft an NX-1 Disruptor. They help a great deal with bigger enemies, especially Rhinos and Mammoths. The gun you choose is completely your choice, whatever you feel comfortable with but provided you use boosters often, I'd recommend the Chain-SAW (especially with Rapid-Fire).

The amount of money you make more than covers you to spend like crazy so DON'T HOLD BACK.

Now the order we used is as follows, keep in mind that the first two generators are tough given your lack of money and weaponry but it will make it infinitely easier at the end.

1) The wide gate straight ahead of spawn.
2) The gate to the right of your spawn.
3) The bottom generator on the right hand side of the map (Through the right gate).
4) The top generator on the right hand side of the map (Probably the most difficult one).

The following four generators are conveniently covered by a Tesla coil air trap. There is one in the parking garage (directly adjacent the first generator) and two at the gas station (one directly right of the generator on the roof and one down the ramp from the roof and to the right)
It should last the whole time a generator is powering up. It will save lives (believe me!).

5) The first generator you encounter in the parking structure (Middle area).
6) The second generator you encounter in the parking structure.
7) The gate to the left of your spawn point.
8) The generator on the bottom of the gas station.
9) The generator on the roof of the gas station.

Using this path should mean you'll only encounter maybe 6 Rhinos and a Mammoth up until this point. It really feels like the easiest path to me. Avoid all other doors at all costs!

Now the ending. Probably the initial onslaught of Rhinos is the toughest part (remember, use the NX-1 objects to deal with them) Make sure any time you aren't being attacked is time spent shooting the Ancestors. Using a fully charged shot of the NX-1 does great damage to them. If you let the Ancestors bank up you will get overwhelmed very quickly.

What we did was went up one of the staircases and camped on the walkway near one of the Anti-Air Tesla traps. From there you should get a good look at one of the oncoming Ancestors and be able to lay into him before he causes too much chaos. If any thing, have two or three people protect one person so he can constantly lay into the Ancestors.

Another way of tackling this section is keep moving around the bottom in a group trying to avoid the Ancestors line of sight. Once one of the Ancestors breaks down the wide front gate you can jump over that and sit in front of the parking structure. It won't stop regular enemies from coming after you but it seems to make it easier to avoid the Ancestors as they can't move through the gate.

Once you have dispatched the three ancestors another one should come later on near the end but he should be a problem. As soon as the communication comes through to activate the Medusa, make your way down to it and all you need to hold X to activate. Once you do that. You have completed this rather difficult task. Congratulations!

If this solution is missing something or if you know a better way to do things than I do, please comment on it so I can amend it and give you the appropriate credit for your help!

This does take a fair bit of co-ordination and skill so please don't be disappointed if this doesn't work you. Be patient and work together and you will pull through.

This is more of a tip in the final area to help people.

This will happen on either the first or second ancestor that you encounter in the final area. An ancestor will break through the main gate (the gate that is directly in front of you when you first start the map)

You can actually go out there with your team and if you go to the right handside there are two traps which you can use (the one by the truck helps ALOT) AND the ancestors wont be able to get you as they will be on the other side of the wall and they NEVER move to this location. this means you dont have to worry about getting hit from the ancestors.

My team and I camped in this location and we didnt bother killing the ancestors at all. the bar will go up slower but you wont have to worry about the ancestors and them hitting you with their deadly black hole attack. you can also get the kill 3 ancestors within 10 seconds this way. we did it first go using this method.

Hope this helps out anyone struggling!

Just to add to Like Gazelle's excellent solution.

If you are following the order listed in Like Gazelle's solution.

When you are in the garage doing the generators there, DO NOT KILL THE ANCESTOR AFTER THE GENERATOR HAS COMPLETED. If you do kill the ancestor after the generator has completed its powering up you will end up glitching the game and you will not be able to trigger the ending with Cross. The second ancestor will not spawn at the Gas/Petrol station and you will have wasted your time.

We have done this in three different sessions all experiencing the same problem. Just be careful. If the ancestor dies during the powering up that is fine, but if they are starting to leave you should not kill them.

I personally have found it is much easier if you start with the gate at the left (where the sticky flare/venom grenade schematics are) and keep following that direction until you get to the office area. Once you reach the offices, do both of those generators and continue into the shanty town area back to spawn. Then your final door will the large front gate at spawn going to the parking structure. *Make note that with any of the "door areas", do the challenge necessary, but if it does not require you to stay in that particular area, feel free to roam around. It helps alot to not be confined to a certain area and in most of those places there are indoor areas where u can funnel the cryptids into hallways and not have to worry about dive bombers and gargoyles shooting from above*. Once all those doors are open, you only have four(4) generators left. Proceed to the gas station, activate those generators and finish out w the last two(2) in the parking garage. Just keep on all of the anti air traps in both the gas station and parking structure areas. Itll save you alot of trouble and ammunition. The final part is up to you, it boils down to team cooridination and communication really. But as far as what route to take, i have found this to be far easier than everything else ive seen thus far.

This may seem incredibly daunting at fist, but I assure you it is very doable even with as few as 2 people. If you try this after just buying the game, it will be next to impossible. You will absolutely need a large amount of teeth upgrades to make this doable. Expect a huge grind to save up the necessary teeth.
There are some teeth upgrades that are quite cheap and don't do much, but when you have a bunch of them they can make a profound difference. I had basically every single smaller upgrade, but if you don't want all of them the main ones I recommend are:

-Start with a locker key (40 teeth)
-Faster revive (10 teeth)
-Higher quality incendiary ammo (5 teeth)
-Hypno-knife a rhino (50 teeth, no need to have more than 1 person with this).
-Start with a skill point (20 teeth)
-Faster health regeneration (5 teeth)
-High grade armor piercing ammo (5 teeth)
-The upgrade of whatever class it is you're using (medic/ weapon specialist, engineer, and tank, each costs 15 teeth, don't waste teeth on more than 1).
-Keep valid attachments (All valid attachments from your current gun will transfer to any new gun you buy, 15 teeth)
-No Snare (Hunter and seekers do not slow your movement when they attack, 10 teeth)
-Arching stun ammo (50 teeth)
-Vulture extended duration (50 teeth, I did this with just one other guy, and he was running IMS, so there is really no need for him to have it, it makes the alreayd powerful vulture even better because it lasts considerably longer, obviously only people running vultures need this upgrade.

Now that's it for cheaper upgrades, for the really expensive upgrades the only ones I suggest you get are
-Cryptid slayer ammo (500 teeth, incredibly expensive, but only one person needs to buy it, this ammo is very powerful as it combines the firepower of all other ammo types, this is especially noticeable when you purchase all the ammo specific teeth upgrades because you get all of them at once, arching stun is very especially powerful.

-Master scavenger (200 teeth, only 1 person needs to buy it, whoever does buy it should be the exclusive person searching things, this allows you to find extended mags and ark attachments, which normally would both be unobtainable on exodus. It also means that any lockers you open will have weapons with extended mags on them already. As well, flares you scavenge will last much longer, and hypno knives yield more powerful allies (especially useful with hypno knife a rhino). It should be noted that even if the master scavenger scavenges a hypno knife or flare, only they can use it to receive the buff, if someone without master scavenger picks it up, it will behave as normal. Anybody can equip extended mags or ark attachments however.

-Pistol ark attachment (125 teeth, everyone should really be getting this, putting one skill point into your pistol will give you an ark attachment on it. This makes your pistol quite powerful.

There are certainly other upgrades that definitely help, these are kind of the ones I found necessary. Something like double class would obviously make a massive difference, but it costs 1000 teeth, so yeah... good luck with that.

This understandably seems like a massive grind to obtain all this stuff, and I would be lying if I said it wasn't. If you're planning on doing all extinction achievements, do all other maps before this one, because you will amass a huge amount in going for those. I also suggest you do those maps in the order they came out, because they get considerably harder going through them, but you will also get considerably better thanks to teeth upgrades (and becoming more skillful at extinction). When nightfall first came out, it was next to impossible for me to do, now I can basically do it with my eyes closed.
You should also be weaving in games on point of contact amidst going for the other achievements, this is without a doubt the best map to farm teeth on, because it is very easy and quick. When you're first starting off, try to just complete the map, try to get all challenges, but that will be hard when you're first starting out.
After you've got some teeth upgrades and you feel like this is too easy, throw on some relics to give you more teeth, also make sure you are at least attempting all challenges.
Finally when you become super powerful, try it on hardcore, this makes even point of contact very challenging so if it is too difficult don't bother until you are better upgraded.
Earning teeth is quite confusing in this game, the key things to remember are:
-You earn 1 tooth every 300 kills, this is basically nothing as 300 kills is quite a bit)
-Completing 10 challenges in a game gives you 2 teeth
-Finishing the map is the most important, I think you get something like 7 teeth.
-Doing all challenges gives you around 3 extra teeth, only if you finish the map
-You get an extra tooth for every relic you have equipped at the end of the map, up to 2. This means you should never really be running more than 2 relics, as it just makes it needlessly harder.
-You get 3 extra teeth for completing a map on hardcore
-You get one tooth every time you prestige.

So basically, the most important thing to do is escaping on point of contact, having relics and doing all challenges will give you even more.

Again, expect this to take you some time, you can't grind the teeth necessary in an afternoon. Anytime me and my friend played we would always do a point of contact game before trying for any achievements.

Setup
So if you believe you have sufficient teeth upgrades, you can actually give this a try. You will have ideally done all the other exodus achievements before attempting this, so you know what challenges to expect, and the map layout.

I did this with one other guy, but its fair to assume that the more the merrier (keep in mind the more people, the more cryptids), that is of course assuming all players have necessary teeth upgrades.

In terms of what to equip:
-Class: When I did it, I was a medic, and my friend was a weapon specialist. If you have 4 guys, I'd suggest 1 (and no more) be an engineer, have either 2 medics and 1 weapon specialist or 1 medic and 2 weapon specialists, no tanks, it sucks.
-Pistol: Grach (obviously)
-Ammo: doesn't matter, just make sure that one person has cryptic slayer ammo equipped, he's the only guy throwing down ammo
-Team support: Armor is a must, I'd suggest 1/2 the players have that equipped. Besides that its up to you, hand boosters is great as is feral instincts, one of each if you have 4 people, I'd suggest hand boosters over feral though otherwise.
-Equalizer: riot shield
-Strike package: The guy doing the ammo should run IMS (because it is cheaper), everyone else should really be running vultures.

-Relic: Ideally, only 1 person should be running a relic on each go, but this means you would have to do this a bunch of times to get everyone the achievement. Some relics are easier to manage then others. Some good ones to use are:
1.Do less damage, the weapon specialist can basically cancel this out
2. Limited ammo, cryptic slayer ammo provides you with a ton of ammo once you start upgrading it, so this is manageable.
3. Smaller wallet: You earn less and can hold less money, mosey comes very easy on this map so this isn't too bad.

If you are running multiple people with relics, make sure they don't run the same ones, this will make it easier. It is ultimately up to you which ones you run, the 3 above I personally found to be the most manageable.

Playing the game

Start the game (making sure it is on hardcore). Now, if you have tried hardcore on point of contact, you may be thinking this is going to be absolutely insane. Don't worry though, in terms of the amount of cryptids that spawn, it is hardly even that different from normal. This isn't a walk in the park mind you, this map is already incredibly challenging. Perhaps the most difficult thing about this is the lack of available skill points. You only get skill points for completing challenges, unlike normal when you get them after every door/ generator. This is why doing as many challenges as you can is absolutely essential.
One additional challenge on hardcore is there is now friendly fire ricochet damage, meaning when you shoot your team mates this inflicts that damage onto you. If you're not paying attention you can quickly obliterate your health like this, so be careful.

When you spawn in have everyone grab a weapon from a locker in spawn, I would also suggest a few people build the NX-1 grenade for later (blueprint is in spawn). The guy with master scavenger should start searching right away, getting as many people as you can an ark/ extended mags.
Doing the generators and doors in a proper order is important, because the doors increase in difficulty separately from the generators, and some locations are much easier than others. The order I suggest is:

1. Door: The door leading to the parking garage, once this is done, all players should grab an NX-1 disruptor schematic, you definitely want all players to build this, it will obliterate rhinos and mammoths very quickly.

2.Door: Head back to spawn and head through the left door towards the gas station.

3. Door: Continue through the gas station and open up the next door to the parking garage.

4. Generator: Do both gas station generators, these ones are probably the hardest locations due to the presence of gargoyles. Using the tesla anti air traps make short work of them. An ancestor will spawn on the second generator here.
Killing an ancestor: You basically want all players to spam their NX-1 at it. This will do a ton of damage and take out its shield. When its shield is down, shoot the heck out of it with any gun, preferably in the head. The ancestor is not a huge threat to you, it will launch very high damage black holes at you, but if you lead them into a wall they will explode and not hurt anybody. It will also kind of force choke you. This is telegraphed by a blue light showing up on the floor somewhere. Just run away from this light, because if he grabs you in it he does a ton of damage and immobilizes you for a bout 5 seconds. Killing an ancestor gives everyone a ton of money so it is worth doing. At the end of the generator, he will run away, you can still kill him but there's no real need to.

5. Door: Head into the parking garage and open the door leading to the restaurant (I think its a restaurant). This one will be very challenging, so be careful.

6. Generator: Do both parking garage generators, again, an ancestor will spawn on the second generator. Rhinos and mammoths will begin spawning as well, your NX-1 does a ton of damage to them and it regens its ammo so shoot its charged shot often.

7. Optional door: The final door in the map, leading from spawn to the restaurant is incredibly challenging, as such, I would usually advise against it as you do not need to do it. If after scavenging everything you didn't find hardly any ark's and extended mags, it may be worth it for the extra skill point and more searchables. A crazy amount of rhinos and mammoths spawn here, again, use that NX-1. Don't be afraid to just run away if it gets to hectic, you may fail the challenge but there is no generator to defend so you just need to keep yourself alive.

8. Generators: Finally the last 2 generators in the restaurant (maybe its not a restaurant actually...) These ones are difficult, but not as hard as the final door. There is no ancestor to worry about thankfully.

9. The final fight. This final fight is honestly not that hard. It's certainly no cake walk, but the area you are in is large. Hopefully you will have gotten a number of arks and extended mag for this. All you need to do is kill a ton of cryptids to power up the cortex. Cryptids will spawn out the wazoo, so keep moving and keep shooting. You will get money like crazy so all players should really have a vulture/ IMS out at all times, and should be very generous with ammo and armor/ boosters. Ancestors will also be spawning, a total of 3. You will also be given challenges during this which are kind of easy, so you should try to do them as best you can for the skill points. You will see little ticks by the progress bar on the left of your screen, which signals the end of the current challenge and the start of the new one (+ another ancestor spawn). You want to make sure you are killing these ancestors ASAP, because you could have up to three harassing you on the map if you don't, and they can become a huge problem to deal with. Of course the hordes of cryptids attacking you does not make doing this any easier.
The more crytids you kill the faster the medusa device charges, the ancestors fill it up consderably on death. You will also see some cryptids attacking the meudsa device. I'm pretty sure all this does is pause its progress until they are killed, I'm almost certain it is impossible to fail here short of everyone dying.
There's not much strategy her besides run and gun, focus ancestors and rhinos/ mammoths, and spam out everything you got as much as you can. The gates the ancestors destroy actually offer very valuable escape routes if need be, so keep that in mind.
Once the medusa is charged all players need to hold on it, ending the game and giving anybody running a relic this achievement.

Because skill points are so rare in this, I'll detail how you should be spending them.
-Usually it's a good idea to put your "start with a skill point" point into your pistol to get the ark right away, you may not want to do that as if you have start with a locker key you will get a powerful weapon right off the bat, so you don't really need to use your pistol, it doesn't hurt to do this though.
-Cryptid slayer ammo should get upgraded right away, put 2 points into it right off the bat, and another point into it later on (upgrade some other stuff first). No need to fully upgrade it.
-Upgrading armor is priority if you are running it, get 2 points into it right away and another later on, usually you won't want more than 3 into it.
-Medics should be putting 2 skillpoints into their medic class to allow them to regen health faster and anybody close to them, this is all you should be putting into your class as a medic.
-A weapon specialist doesn't really need to be putting anything into his class, you may want to put 1 or 2 into it if you don't know what else to upgrade.
-The engineer should put 1 point into his class to make repairing the generators easier, other than that there isn't much need. Make sure the engineer is always the one activating the generator to give it the 25 extra health.
-The vulture you want to start upgrading last, after you have put a few points into your class (if you're a medic), or your armor. You want to have it +3 upgraded by the final fight, and during the fight you may want to save up 3 skill points to get it fully upgraded, making it very powerful.
-No need to upgrade your IMS at all as the ammo guy, don't be afraid to throw them down as often as you can, they are very cheap and even non- upgraded deal a ton of damage.
-Never upgrade your riot shield at all, it is only 700 points to equip and will protect your back very well. Make sure you always have one on your back.

There is a little room for experimentation here, do what you find works best.

Challenges

The challenges on this map are probably nothing new. Some are very easy, some are quite difficult. You should be pros at doing challenges at this point. When opening doors, usually the challenge will be "kill x number of cryptids from inside the circle". Again, nothing new, the only difference is the circle will move somewhere nearby after 5 kills.
Some challenges can be annoying, especially the "kill 20 cryptids with whatever gun" challenge if nobody already has the gun. None are all that difficult.
During the final fight you will get 3 total challenges and these ones are pretty unique. Offhand I can remember 3 (there might be more)
-Kill an ancestor in under 180 seconds: quite easy, you should be focusing the ancestor as soon as he spawns in anyway, 180 seconds is lots of time.
-Do not take any damage from ancestors for some amount of time: This one can be kind of tricky. Keep your distance from the ancestor so it can't force choke you (it has a small range), and try to keep a wall between you and it, so if it throws a black hole it will hit the wall before it reaches you.
-Deal some amount of damage in critical hits to an ancestor: Very easy, shoot it with your NX-1 and shoot its head a bit, you only need to land a few shots.

Again, doing as many possible challenges as you can is essential to doing this, as that's the only way you earn points.

This is probably the hardest extinction achievement and requires a team of very high level and skilled players to complete. I can not emphasize how important getting a crazy number of teeth upgrades is, at minimum, the ones I listed, but getting more than that certainly does not hurt. With a plethora of teeth upgrades it is very conceivable to do this with 2 people (which I did). Solo I guess it would be possible, but considering you need to worry about, ammo, armor, and your vulture at the same time, and there are so few skill points available, it would be incredibly difficult.

If you have any questions or tips, feel free to leave them in the comments or message me directly.

Good luck!