Frozen in Time
Kill 50 Necromorphs while they are in Stasis (single player only)
3/3/2011
12:39:39 AM
Rare 28.0%
Clean Cut
Sever all three tentacles of a Lurker with one Line Gun Primary Fire shot (single player only)
2/24/2011
6:39:12 PM
Rare 21.7%
Ultimate Nullifier
Perform 30 successful Advancing Guards. (Arcade/online only)
2/22/2011
5:37:00 AM
Rare 11.8%
Turn the Tables
Land a Team Aerial Counter in a match. (Arcade/online only)
2/22/2011
5:23:48 AM
Rare 23.1%
The Sampler Platter
Kill a Necromorph with every Weapon in the game (single player only).
2/21/2011
10:03:03 PM
Very Rare 8.7%
C-Section
Knock down an enemy with Contact Beam Alt-Fire then kill it with Primary Fire before it stands up
2/21/2011
7:59:36 AM
Rare 11.3%