Kill 75 enemies while in the stealth mode of Overkill.
Kill 25 enemies total using RPGs.
Kill 250 enemies total using SMGs.
Kill 250 enemies total using Machine Guns.
Kill 25 Martyrs by shooting the Bomb Packs on their chests.
Drag and heal your partner 25 times.
Kill 5 enemies total using Co-op Snipe.
Kill 100 enemies total using Sniper Rifles.
Kill 100 enemies while in the power mode of Overkill.
Spend 1 minute straight at full Aggro.
Purchase the MP7, M134, DAO-X Protecta, MGL MK-X, and the M107 Light Fifty.
Continue playing to unlock this secret achievement.
Kill 250 enemies total using Shotguns.
Kill 25 Heavy Armor enemies.
Purchase every mask variant.
Purchase 3 weapons.
Complete all missions with the Partner AI.
Kill 30 enemies using the Riot Shield melee attack
Kill 50 enemies total in Back-to-Back.
Kill 250 enemies total using Assault Rifles.
Kill 150 enemies total using Handguns.
Kill 50 enemies total using the Melee Attack.
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 50 enemies total in Co-op Riot Shield.
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.
Collect all of the information cases in the entire game.
