Still Alive
Complete Course 4 with neither you nor your co-op partner dying
9/17/2011
5:18:49 PM
Ultra Rare 1.4%
Discerning Taste
Take down a street performer who is imitating a statue.
9/16/2011
2:30:08 AM
Common 63.7%
Watch That First Step
Defeat an enemy by destroying the object they stand on.
9/15/2011
11:07:19 PM
Common 82.7%
Party of Three
Find the hidden companion cube in co-op test chamber
9/13/2011
3:29:40 AM
Ultra Rare 2.9%
Four Ring Circus
Enter 4 different portals without touching the ground in co-op
9/13/2011
2:19:57 AM
Ultra Rare 4.6%
Iron Grip
Never lose a cube in Chamber 6 of the Mass and Velocity co-op course
9/13/2011
2:00:34 AM
Ultra Rare 2.8%
Empty Gesture
Drop your co-op partner in goo while they are gesturing by removing the bridge under them
9/13/2011
1:38:38 AM
Ultra Rare 3.9%
Triple Crown
Solve 3 co-op chambers in the Mass and Velocity course in under 60 seconds each
9/13/2011
1:30:19 AM
Ultra Rare 1.8%
Portal Conservation Society
Complete Chamber 3 in the Hard-Light Surfaces co-op course using only 5 total portal placements
9/13/2011
1:03:41 AM
Ultra Rare 2.1%
Asking for Trouble
Taunt GLaDOS in front of a camera in each of the five co-op courses
9/12/2011
1:02:14 AM
Very Rare 6.0%
Obstacle Building
Complete all test chambers in the Excursion Funnels co-op course
9/12/2011
12:55:42 AM
Rare 15.7%
Bridge Building
Complete all test chambers in the Hard-Light Surfaces co-op course
9/11/2011
8:14:38 PM
Rare 20.6%
Can't Touch This
Dance in front of a turret blocked by a hard light bridge in co-op
9/11/2011
6:49:56 PM
Very Rare 7.9%
Confidence Building
Complete all test chambers in the Mass and Velocity co-op course
9/10/2011
8:46:38 PM
Rare 31.6%
Team Building
Complete all test chambers in the Team Building co-op course
9/10/2011
6:52:22 PM
Rare 46.8%
Narbacular Drop
Place a portal under your co-op partner while they are gesturing
9/10/2011
6:06:31 PM
Very Rare 5.5%
