Clean Cut
Sever all three tentacles of a Lurker with one Line Gun Primary Fire shot (single player only)
8/16/2011
3:48:33 PM
Rare 21.7%
The Sampler Platter
Kill a Necromorph with every Weapon in the game (single player only).
8/9/2011
7:16:28 PM
Very Rare 8.7%
Burnout
Fill the Nitrous bar then use it all in one go without hitting anything
8/7/2011
7:08:43 PM
Common 85.7%
A Hero Stands Alone
Win a match without calling your partners or switching out. (Arcade/online only)
8/7/2011
4:44:58 PM
Rare 39.1%
Iron Man - Why We Fight
Complete chapter 1 in the Single Player Campaign without dying or restarting a checkpoint
8/7/2011
4:00:07 PM
Very Rare 5.2%