 | One-Night Stand | 10  |
Complete 1 chapter in co-op on any difficulty (Marcus or Dom) |
 | Open Relationship | 30  |
Complete 10 chapters in co-op on any difficulty (Marcus or Dom) |
 | Friends with Benefits | 50  |
Complete all acts in co-op on any difficulty (Marcus or Dom) |
 | Once More, With Feeling | 10  |
Perform 30 perfect active reloads (any mode) |
 | Takes a Licking | 30  |
Melee 30 Tickers (any mode) |
 | Organ Grinder | 10  |
Kill 30 enemies with a cover mounted Mulcher (any mode) |
 | Shock and Awe | 10  |
Kill 30 enemies with the heavy Mortar (any mode) |
 | Said the Spider to the Fly | 10  |
Kill 10 enemies with a planted grenade (any mode) |
 | Crowd Control | 10  |
Melee 10 enemies down with the Boomshield equipped (any mode) |
 | Smells Like Victory | 10  |
Kill 30 enemies with the Scorcher Flamethrower (any mode) |
 | Variety is the Spice of Death | 30  |
Kill an enemy with every weapon in the game (any mode) |
 | Seriously 2.0 | 50  |
Kill 100,000 enemies (any mode) |
 | Standing Here, Beside Myself | 10  |
Win 3 matches of Wingman (public) |
 | Beat the Meatflag | 10  |
Capture 10 meatflags in Submission (public) |
 | It's Good to be the King | 10  |
Win 10 rounds of Guardian as the leader (public) |
 | You Go Ahead, I'll Be Fine | 10  |
Win three matches of King of the Hill (public) |
 | Back to Basic | 10  |
Successfully complete the 5 lessons of multiplayer Training Grounds |
 | Party Like It's 1999 | 30  |
Play 1999 rounds of multiplayer (any mode) |
 | Around the World, Again | 30  |
Win a multiplayer match on each map (any mode) |
 | Dirty, Dirty Horde | 20  |
Survive the first 10 waves of Horde (any difficulty, any map) |
 | Hoard the Horde | 30  |
Survive all 50 waves of Horde (any difficulty, any map) |
 | Crossed Swords | 10  |
Win 10 chainsaw duels (any mode) |
 | A Parting Gift | 20  |
Kill 10 enemies with a grenade while down but not out (any mode) |
 | Pound of Flesh | 10  |
Use a meatshield to save your life 10 times (any mode) |
 | Photojournalist | 10  |
Submit a spectator photo |
 | Kick 'Em When They're Down | 10  |
Perform all 11 unique executions on a downed enemy |