The following achievements require the Co-op Collection 2 bonus downloadable content.

Achievement	How to unlock
Bridges (Co-op) Perfect ( 15 points )	Complete Bridges Co-op Mission without respawns at default or hard difficulty.
Color Guard ( 15 points )	Kill 3 enemies while you carry a flag in a CTF match on a Co-op Collection Pack 2 map. Minimum 5 players.
Depot (Co-op) Perfect ( 15 points )	Complete Depot co-op mission without respawns at default or hard difficulty.
Ghost Town (Co-op) Perfect ( 15 points )	Complete Ghost Town co-op mission without respawns at default or hard difficulty.
Pistoleer ( 20 points )	Kill 6 or more enemies with a pistol in a single match on a Co-op Collection Pack 2 map. Minimum 5 players.
Riverbed (Co-op) Perfect ( 15 points )	Complete Riverbed co-op mission without respawns at default or hard difficulty.
Stronghold (Co-op) Perfect ( 15 points )	Complete Stronghold co-op mission without respawns at default or hard difficulty.
Untouchable ( 15 points )	Survive 10 minutess, killing at least 3 enemies in that time, on a Co-op Collection Pack 2 map. Minimum 5 players.