They Go "Boom"
Get 30 kills with the Magnum secondary fire in the single player Campaign.
3/13/2009
9:51:48 PM
Rare 17.4%
Specter Officer
Reach max level with one class in the Cooperative campaign.
3/6/2009
7:36:16 PM
Ultra Rare 2.3%
Spitting Lead
Kill 50 enemies using the Wraith with the force barrier engaged in the single player Campaign.
2/15/2009
1:59:51 PM
Rare 12.3%
Purple Heart
When staring into the face of adversity, show courage and persevere.
2/7/2009
5:36:35 AM
Rare 28.3%
Snake in the Grass
Take out a Japanese soldier lying in wait in the grass.
2/7/2009
4:32:11 AM
Rare 44.5%
For Close Encounters
Get 10 one-hit head-shot kills with the shotgun in the single player Campaign.
1/9/2009
11:15:41 PM
Rare 22.1%
Along for the Ride
Beat an instrument-specific challenge while playing another instrument
1/3/2009
11:05:59 PM
Very Rare 9.3%