Primarch Hunter
Kill 200 Elite Chimera in the Cooperative campaign.
12/24/2010
3:24:37 PM
Very Rare 6.2%
Surf and Turf
Win an Online race on each of the eight ADRENALINE tracks
12/24/2010
1:50:55 PM
Ultra Rare 0.1%
Ultimate Knockout
From the gassed state, KO an opponent in any mode.
12/24/2010
1:11:37 PM
Common 76.3%
The Ultimate Sacrifice
Complete the Arrival DLC ("Arrival" downloadable content)
12/24/2010
12:38:39 PM
Rare 10.3%
Brother Time
Complete the 3 missions for the South Central time trial.
12/24/2010
12:02:09 PM
Ultra Rare 2.3%
The nature of evil
Eliminate 10 players while blind firing from cover across all games.
12/24/2010
10:51:47 AM
Ultra Rare 4.0%
Asking for Trouble
Taunt GLaDOS in front of a camera in each of the five co-op courses
12/24/2010
10:51:47 AM
Very Rare 6.0%
Ultimate Hero
Trigger Your Ultimate Ability 3 Times Within One Challenge
12/24/2010
10:19:37 AM
Rare 23.0%
False Sense of Security
Attack 24 cloaked Spectres while using the Infiltrator's Thermal Vision
12/24/2010
8:46:23 AM
Very Rare 8.2%
Further Qualifications
Beat Developer Ghosts on all eight ADRENALINE tracks
12/24/2010
8:46:23 AM
Ultra Rare 0.1%
Italian Scout
Complete 10 solo objectives in the "Italian Motor Racing" Playlist
12/24/2010
8:25:08 AM
Ultra Rare 0.2%
Revenge!
Gain the loyalty of the mercenary ("Cerberus Pack" downloadable content)
12/24/2010
6:58:00 AM
Rare 30.5%
Specter Officer
Reach max level with one class in the Cooperative campaign.
12/24/2010
6:49:16 AM
Ultra Rare 2.3%
A measure of comfort
Eliminate 1,000 players across all games played.
12/24/2010
4:17:41 AM
Ultra Rare 3.5%