Scavenger
Collect all weapons, text logs and audio logs on Chapter 5: "Emergency Care"
5/27/2011
2:57:35 AM
Very Rare 5.1%
Quit Yacking And Start Shooting
Complete Chapter 4: "Rendezvous with Fate"
5/27/2011
12:09:46 AM
Rare 25.9%
Figments Of My Imagination
Complete Chapter 3: "Return to the Megavents"
5/26/2011
11:39:41 PM
Rare 29.6%
Vacuum Cleaner
Decompress 20 Necromorphs without getting sucked out yourself
5/26/2011
7:28:16 PM
Very Rare 6.9%
My Boom Stick
Kill 6 enemies at once with Line Gun's Alt-Fire (single player only)
5/26/2011
3:24:45 AM
Rare 10.3%
...And Stay Down
Kill 25 crawling enemies with Stomp (single player only)
5/26/2011
3:00:02 AM
Rare 14.5%
Frozen in Time
Kill 50 Necromorphs while they are in Stasis (single player only)
5/22/2011
7:09:48 PM
Rare 28.0%