Call of Duty: Ghosts

How to make this Achievement Extremely easy and to kill two birds with one Stone is to play until your first prestige so you can go for the Relic Achievement as well.

**You must complete all of the challenges in a single game AND escape in order for the achievement to unlock**

You'll want to play with the relic pistols only and play in a solo match by yourself.

My Setup.

Class: Medic (because the 4th upgrade stops ongoing damage from scorpion gas clouds)
Pistol: MP-443 Grach Pistol
Ammo: Explosive ( It works best against all types of enemies)
Support: Armor
Strike: Sentry
Equilizer: Riot Shield

The benefit of playing by yourself with a relic on is that you won't get the challenges for killing enemies with a certain type of weapon.

Now here are my tips.

1. Search the first area until you find a flare, because when the challenge comes up for finding the leaper and killing him within 30 seconds, the flare makes this one a joke.

2. Upgrade your turret slot all the way, and then the pistol all the way, and then do your medic class until the 4th slot so you don't take ongoing damage from gas clouds.

3. Turrets Turrets Turrets! these guys are your best friends and your primary goal should be to protect them and keep them alive.

I got this Achievement on my first try using this method playing by myself! I hope this helps,

This achievement can be difficult but not impossible. What you need first and foremost is four sensible, great players who are either high level (>22) or prestiged, who are good communicators and will work in a group.

Most of the challenges are fairly self explanatory and easy enough to obtain when working together. Some require you to put your turrets away (face them against a wall), such as melee killing or killing with a certain class of weapon. It is best to not setup new turrets until you know what the challenge actually is (after the drill has been set). Here's some of the tricky ones:

* Don't reload for the first 60 seconds: Be aware that throwing out ammo and sometimes switching weapons can trigger an automatic reload.
* Maintain an accuracy of 50%/75% or above: determine which person in the group is the best shooter, and let them make the necessary shots. It's best to perform this when an alien is attacking the drill. Turret bullets luckily do not count, so go nuts with those and rely on melee for defense or cleaning up the mess. Keep your finger off RT!
* Kill the leper in the first 30/60 seconds: depending on which wave this comes up, this can really hard to get. However as per usual use a flare and fire on anything that moves - 90% of the time this should be good enough. As started in other solutions, KILLING THE LEPER WITH A TURRET DOES NOT COUNT, so tuck your turrets away temporarily. (Note: there are reports that this challenge may have a 30 second limit now.)
* Kill 5 aliens while they are in the air: electric fences are your best bet, otherwise try to get up high like on a fence, roof, top of truck etc and time your shots.
* Kill 25 aliens with a sniper rifle: Abandon all hope. If you want to give it a try, grab a sniper rifle AND then grab new ammo (armor piercing hopefully, explosive as a fallback) as your previous ammo doesn't come with you. Use a flare to draw aliens into one area and fire away. Preferably get a number of people in your team to get the sniper rifle. I haven't seen a team ever get this challenge, but I'm sure it can be done.

If you're playing to grind, time efficiency would say that if you fail a challenge before the second barrier hive you should end the game and start over. If you fail a challenge after that, it's still worthwhile doing the rest of the waves for practice.

This achievement isn't very hard as long as you have 4 people with mics and Turrets. Most of them are simple like get a certain amount of kills with a specific weapon. Just buy the weapon and only get kills with it for that one. If you get the one for keeping your accuracy up, only shoot one bullet and knife/turret the rest of the enemies. The harder ones consist of finding something called the Leper or something like that. He looks like one of the smaller enemies except he's all white and larger. He appears in random places, usually towards the beginning away from where you are. You CANNOT kill him with Turrets or you FAIL. Try throwing a flare in the open and lure him out with that. Another hard one is avoiding damage from the pink things that explode. Just set up turrets and keep a distance from the alien pods that fall down. When you reach the end, before you activate the nuke, run to where the first wall you have to defend is going to be. Set up all your turrets here so that they will kill the rhinos. Make sure you have your pistols out and run as fast as you can. After the second barrier remember to re-drop your turrets while you run to get the aliens off of your ass lol. I know this isn't a complete guide but the achievement isn't as hard as it seems. Just need turrets and 4 people with mics. Almost impossible to do with random teammates. Especially if they are a low rank. Most of the challenges should be self explanatory but if you have to kill the Leper late into it while your turrets are up it can be a pain. Good luck.

Kill 5 aliens while they are in the air

weapon special +sniper rifle +high ground (as high as possible cause it take longer for Alien to jump to the high ground ) and its very easy to one shot kill them when they are jumping.
second AO is easier to do this than the firest AO ,,depend on your luck