Stalker
Collect 75% of the journal intelligence found throughout the game.
9/11/2010
9:01:02 PM
Rare 19.6%
Complete: Nurse's Office
Complete Mission on any difficulty: Nurse's Office
9/11/2010
6:07:39 PM
Rare 40.2%
Historian
Collect 50% of the journal intelligence found throughout the game.
9/10/2010
9:30:11 PM
Rare 38.3%
Nowhere to Hide
Tag and kill 30 enemies with the Bullseye secondary fire in the single player Campaign.
9/4/2010
8:24:44 PM
Rare 15.4%
They Go "Boom"
Get 30 kills with the Magnum secondary fire in the single player Campaign.
8/30/2010
12:46:43 AM
Rare 17.4%
Sharpshooter
Get 30 headshots while scoped in with the Fareye or Marksman in the single player Campaign.
8/29/2010
11:07:08 PM
Rare 31.1%
Explosives Expert
Get 150 kills with the Carbine 40mm, LAARK, or frag grenade in the single player Campaign.
8/28/2010
11:22:39 PM
Rare 18.7%
Pack Addict!
Upgrade 5 weapons at the Pack A Punch Machine. (Map Pack 3 only)
7/31/2010
9:48:14 PM
Very Rare 5.4%
Purple Heart
When staring into the face of adversity, show courage and persevere.
7/4/2010
1:09:06 AM
Rare 28.3%
Acquire Waffle Weapons!
Obtain the Ray Gun, DG-2, and the Monkey Bomb at the same time in a game. (Map Pack 3 only)
7/2/2010
6:07:29 AM
Very Rare 5.6%
Perkaholics Anonymous!
Survive until round 20 without buying a single Perk. (Map Pack 3 only)
6/5/2010
10:48:27 PM
Ultra Rare 4.7%
Der Electrician!
Link all teleport pads before round 7. (Map Pack 3 only)
6/1/2010
11:21:53 PM
Very Rare 7.6%