Perform 50 headshot kills in the single player campaign.

Force an enemy to drop dynamite that kills two people when exploding.

Kill 35 enemies with the pistol.

Complete one optional tomb.

Dismember 25 Necromorph Limbs (single player only)

Identify Black Mask's assassins

Survive the attack on Paladin

Complete a single player mission without being detected during gameplay

Complete Transit Yards on any difficulty

Complete Abandoned Mill on any difficulty

Complete American Consumption on any difficulty

Upgrade any weapon to the next level