Knock-knock
Kill 4 enemies with 4 shots during a slow-mo breach in Single Player or Special Ops.
5/24/2010
2:44:03 PM
Rare 15.2%
Pit Boss
Run The Pit in 'S.S.D.D' and finish with a final time under 30 seconds.
5/9/2010
7:46:50 AM
Ultra Rare 2.8%
The Price of War
Complete the single player campaign on Hardened or Veteran Difficulty.
5/8/2010
11:19:40 AM
Very Rare 5.8%
Safety First - Shoot off 100 helmets
Shoot off 100 Helghast helmets during battle
4/13/2010
2:38:39 PM
Rare 35.9%
Drive By
Kill 20 enemies in a row while driving a vehicle in Single Player or Special Ops.
4/4/2010
11:52:53 AM
Very Rare 8.1%
Messer Sandman
Stun 4 guards at once by throwing sand in their face.
3/21/2010
5:03:48 PM
Very Rare 9.1%
