Full list of all 47 Army of TWO achievements worth 1,250 gamerscore. It takes around 40-50 hours to unlock all of the achievements in the base game on Xbox 360.
The base game contains 37 achievements worth 1,000 Gamerscore, and there are 2 DLC packs containing 10 achievements worth 250 Gamerscore.
Kill 75 enemies while in the stealth mode of Overkill.
Kill 50 enemies total in Co-op Riot Shield.
Heal your partner for the first time. Training does not count.
Complete all missions as a Professional.
Earn one million dollars in total over the course of campaign mode.
Kill 25 Martyrs by shooting the Bomb Packs on their chests.
Kill 100 enemies while in the power mode of Overkill.
Kill 30 enemies using the Riot Shield melee attack
Kill 25 enemies total using RPGs.
Complete all missions with the Partner AI.
Collect all of the information cases in the entire game.
Kill 250 enemies total using Machine Guns.
Kill 150 enemies total using Handguns.
Spend 1 minute straight at full Aggro.
Completed Mission 5 as Contractor or higher.
Kill 100 enemies total using Sniper Rifles.
Completed Mission 4 as Contractor or higher.
Completed Mission 6 as Contractor or higher.
Kill 25 Heavy Armor enemies.
Kill 5 enemies total using Co-op Snipe.
Kill 250 enemies total using SMGs.
Kill 250 enemies total using Shotguns.
Completed Mission 3 as Contractor or higher.
Kill 50 enemies total using the Melee Attack.
Completed Mission 2 as Contractor or higher.
Purchase the MP7, M134, DAO-X Protecta, MGL MK-X, and the M107 Light Fifty.
Completed Mission 1 as Contractor or higher.
Purchase every mask variant.
Purchase 3 weapons.
Drag and heal your partner 25 times.
Kill 50 enemies total in Back-to-Back.
Kill 250 enemies total using Assault Rifles.
Finish playing a versus ranked match.
Complete 20 minor objectives in a ranked match.
Complete a ranked match without ever needing to be revived.
Earn one billion dollars in total in ranked matches.
Win a ranked match without purchasing any additional weapons.
Win every stage of a ranked three round SSC Challenge match
Destroy 500 barrels in ranked SSC Challenge matches
Win a ranked SSC Challenge match
Achieve 75% accuracy at the conclusion of a ranked three round SSC Challenge match
Kill Dalton in less than 40 seconds
Completed Mission 8 as Professional.
Destroy 300 destructible objects in Mission 7,8
Completed Mission 7 as Professional.
Final blow to Dalton is a headshot with a pimped .44 MODEL 29 handgun
Buy the 'pack 8' gun pack in a multiplayer ranked match