Leader of Humanity
Completely finish either of the story missions "Those Who Understand" or "Those Who Fight."
12/23/2010
12:42:48 PM
Common 64.6%
Ten plus foot-mobiles
Kill at least 10 enemies with one Predator missile in Single Player or Special Ops.
12/3/2010
12:43:03 PM
Rare 45.1%
Desperado
Kill 5 enemies in a row using 5 different weapons or attachments in Single Player or Special Ops.
12/3/2010
12:22:08 PM
Rare 21.2%
Two Birds with One Stone
Kill 2 enemies with a single bullet in Single Player or Special Ops.
12/2/2010
1:36:07 PM
Common 57.6%
Three-some
Kill at least 3 enemies with a single shot from a grenade launcher in Single Player or Special Ops.
12/2/2010
1:22:30 PM
Common 54.5%
Two is Better Than One
Complete 386 areas with one or more other players.
10/30/2010
2:02:55 PM
Ultra Rare 0.8%
Specter Officer
Reach max level with one class in the Cooperative campaign.
10/9/2010
3:15:28 PM
Ultra Rare 2.3%
Tour of Duty
Complete one mission on each region in the Cooperative campaign.
9/17/2010
3:21:46 PM
Very Rare 7.4%
Primarch Hunter
Kill 200 Elite Chimera in the Cooperative campaign.
9/11/2010
4:00:32 PM
Very Rare 6.2%
Team Player
Complete 5 missions with a full party of 8 in the Cooperative campaign.
9/10/2010
3:49:23 PM
Rare 10.9%
Specter Recon
Collect 50 pieces of gray tech in the Cooperative campaign.
9/8/2010
12:59:58 PM
Rare 15.6%