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.
Complete all missions with the Partner AI.
Earn one billion dollars in total in ranked matches.
Completed Mission 6 as Contractor or higher.
Complete all missions as a Professional.
Kill 75 enemies while in the stealth mode of Overkill.
Collect all of the information cases in the entire game.
Kill 50 enemies total in Co-op Riot Shield.
Complete 20 minor objectives in a ranked match.
Win a ranked match without purchasing any additional weapons.
Complete a ranked match without ever needing to be revived.
Kill 250 enemies total using Shotguns.
Finish playing a versus ranked match.
Purchase the MP7, M134, DAO-X Protecta, MGL MK-X, and the M107 Light Fifty.
Earn one million dollars in total over the course of campaign mode.
Kill 100 enemies while in the power mode of Overkill.
Kill 25 Martyrs by shooting the Bomb Packs on their chests.
Kill 100 enemies total using Sniper Rifles.
Kill 5 enemies total using Co-op Snipe.
Completed Mission 5 as Contractor or higher.
Kill 30 enemies using the Riot Shield melee attack
Completed Mission 4 as Contractor or higher.
Kill 25 Heavy Armor enemies.
Drag and heal your partner 25 times.
Kill 250 enemies total using SMGs.
Purchase every mask variant.
Kill 25 enemies total using RPGs.
Kill 50 enemies total using the Melee Attack.
Completed Mission 1 as Contractor or higher.
Kill 150 enemies total using Handguns.
Kill 250 enemies total using Machine Guns.
Spend 1 minute straight at full Aggro.
Kill 50 enemies total in Back-to-Back.
Kill 250 enemies total using Assault Rifles.
Purchase 3 weapons.
Completed Mission 3 as Contractor or higher.
Heal your partner for the first time. Training does not count.
Completed Mission 2 as Contractor or higher.
Destroy 500 barrels in ranked SSC Challenge matches
Achieve 75% accuracy at the conclusion of a ranked three round SSC Challenge match
Win a ranked SSC Challenge match
Win every stage of a ranked three round SSC Challenge match
Completed Mission 8 as Professional.
Destroy 300 destructible objects in Mission 7,8
Completed Mission 7 as Professional.
Kill Dalton in less than 40 seconds
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