Defeated 100 enemies at once in Frenzy Mode.

Pick a lock for the first time.

Kill 2 or more enemies at the same time with a melee weapon.

Finish your first co-operative quest (local or online).

Ace Winchester's game 3 times

Unlock the Bullet

Win a match by time out

Complete all 4 main character Pasts

Open the shortcut to the Second Chamber

Kill the Convict's Past

Kill the Marine's Past

Clear the Third Chamber 30 Times