The list of achievements for Army of Two: Devil's Cartel recently dropped and I'll admit, I'm a little disappointed. There's not a single achievement for fist bumping your partner. Not one! What is the world coming to??? Anyways, there are still a few co-op specific achievements that have been revealed amidst the usual overall progression ones. No spoilers in the list, so feel free to peruse away.
While there may not be a great number of co-op achievements for the game (at least when you consider how they've focused on making it cooperative), Nick's limited hands-on time with the game makes it sound like it should be a fairly solid co-op title. Personally, I'm a fan of the "Double Trouble" and "Combo Master" achievements, and appreciate the image used for "TWO heads".
Sir, yes sir! 20
Level up to Rank 5Keep it up! 30
Level up to Rank 15Blood, Sweat and Guns 50
Level up to Rank 25My Baby 10
Fully customize a weapon with 6 customizable parts or moreOverkiller 20
200 targets killed in single Overkill (Triggered by you)Whack-A-Mask 20
500 targets killed while in coverDouble Trouble 50
200 targets killed in double OverkillMoocher 20
200 targets killed in single Overkill (Triggered by your partner)Let ‘er Rip 20
100 targets killed using either an MMG or an MGLBarbarian 10
Destroyed 500 objectsArmed to the Teeth 25
Buy All GunsLook at you! 25
Buy All OutfitsLook mom, I made it! 100
Complete the game on InsaneDeep Pockets 100
Buy all Weapons, Tattoos, Masks and OutfitsArmy Of TWO™ 75
Perform 250 Flank, Surprise and/or Tag Team killsAggro-er 40
You took the Aggro for 100 Flank killsHeadache 30
Perform 100 HeadshotsBlood Sport 25
Perform 100 melee killsJust a scratch 25
You didn’t go wounded once in a mission (medium, hard or insane)Combo Master 30
Perform a x10 Co-op ComboMelee all day! 10
Perform a melee kill while you're in OverkillCover Hopper 10
Perform 10 cover to cover transition in a rowTWO heads 10
Complete a mission (excluding New Blood) with a human partner
Army of Two: Devil's Cartel arrives later this month on March 26, so get ready to don your mask and make a silencer from a soda can.
Source: Xbox360achievements.org