Conflict Denied Ops

This is assuming that you can't find anyone to play with. I can't even find people to boost the simple multiplayer achievements at this point.

The easiest way to get this is to start a new campaign. This gives you the ability to save whenever and as often as you want. Play a co-op split screen and simply move one guy forward a little bit, shoot some guys, and save. Repeat over and over, saving as often as you want. Of course, if you get wounded or "Go MIA" then press pause and load up your last save. It takes a little while but it is the easiest way to get it.

The achievement will pop at the screen where you get the new weapon upgrades following the mission.

GUIDE FOR - "KillStreak" (For killing 50 enemies without going MIA), "Aint got time to bleed" (dont go MIA in a mission), "Perfect Partner" ( you and you co-op partner dont go MIA in a mission), and finally "Co-Operative" (for beating a mission in co-op)
can be done with a second controller.

if going solo with a second controller, i recommend playing as LANG the MG guy.
i just did this by myself on level 1.

just keep graves in spawn until you need him to plant the C4, after this make sure you kill everybody along the way so they dont go for GRAVES.

its not very hard as long as you keep the second controller out of the way and focus on "sniping" with the MG (using "R3" or click the right stick)

when you get to the part where you steal a "tank". i had graves get inside the tank and stay behind me a little ways and progressed on foot as lang. (note you also have a ally chopper at this point, it kills most enemies but may also leave some behind)

there are 2 enemy tanks, this is the only real challenge of the level as they can potentially one hit you. the first tank the chopper will most likely kill if you stay out of its way ( after the ally chopper takes down the enemy chopper it will focus on the tank)

move up a little ways killing some more enemies. and you get to the "Big" battle at the end. this is where the 2nd tank is.
what i did was stay right at the front and mg snipe all the foot soldiers i could see ( for the most part they come to you no need to risk yourself by looking for them)

now i almost died at this part and its the only part i almost died.

when you feel comfortable enough that most foot soldiers are dead, push up going AROUND the OUTSIDE of the map to the left, behind "houses". i almost died because i didn't even see or know the tank was there, however if you push up behind the last house on the left, the chopper pilot comes in on the radio for support. HE WILL KILL the tank for you and destroy the barricade.

all thats left is to kill any remaining foot soldiers that might shoot you on the way out, and the to go passed the barrier to the exile point. (NOTE: there is no reason to bring GRAVES to the Exfil, the mission ends when either player reaches the exile point).

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doing this after already completing the campaign once, i Unlocked "KillStreak" (For killing 50 enemies without going MIA), "Aint got time to bleed" (dont go MIA in a mission), "Perfect Partner" ( you and you co-op partner dont go MIA in a mission), and finally "Co-Operative" (for beating a mission in co-op)


hope this helps someone