Elementalslayer - Kill the ArcTrooper within 1 minute 30 seconds
Kill the Tharsis Refinery ArcTrooper in under 1 minute 30 seconds
8/16/2009
7:54:26 PM
Rare 28.2%
Run and Gunner - Kill 3 Helghast with one burst of assault rifle fire
Kill 3 Helghast using an M82 or StA52 assault rifle without releasing the trigger
8/16/2009
7:13:46 PM
Rare 12.4%
Defensive Fighter - Kill 30 Helghast with an emplaced weapon
Kill 30 Helghast using the StA3 fixed gun emplacement
8/16/2009
3:30:16 AM
Rare 45.1%
Bullet Counter - Manually reload 150 times
Manually reload your weapon 150 times
8/16/2009
3:26:05 AM
Rare 33.1%
Weapon of Minor Destruction
Kill no more than one zombie with a nuke. (Map Pack 2 only)
8/1/2009
5:53:54 PM
Very Rare 7.0%
Hammer Time
Repair 200 window boards in a single game. (Map Pack 2 only)
6/21/2009
3:05:50 AM
Ultra Rare 3.9%