C-Section
Knock down an enemy with Contact Beam Alt-Fire then kill it with Primary Fire before it stands up
2/6/2013
8:49:28 PM
Rare 11.3%
...And Stay Down
Kill 25 crawling enemies with Stomp (single player only)
2/5/2013
10:03:33 PM
Rare 14.5%
Shock Therapy
Impale an enemy with the Javelin Gun and use its Alt-Fire to shock 3 others (single player only)
2/5/2013
7:33:44 PM
Rare 17.5%
Skewered in Space
Impale an enemy into a Decompression Window to cause it to blow out
2/5/2013
7:29:06 PM
Rare 11.0%
Frozen in Time
Kill 50 Necromorphs while they are in Stasis (single player only)
2/5/2013
7:20:43 PM
Rare 28.0%
The Sampler Platter
Kill a Necromorph with every Weapon in the game (single player only).
2/5/2013
6:37:37 PM
Very Rare 8.7%
Clean Cut
Sever all three tentacles of a Lurker with one Line Gun Primary Fire shot (single player only)
2/5/2013
2:22:10 PM
Rare 21.7%