Iron Grip
Never lose a cube in Chamber 6 of the Mass and Velocity co-op course
1/7/2012
1:36:44 AM
Ultra Rare 2.8%
Asking for Trouble
Taunt GLaDOS in front of a camera in each of the five co-op courses
1/6/2012
8:06:08 PM
Very Rare 6.0%
Obstacle Building
Complete all test chambers in the Excursion Funnels co-op course
1/6/2012
7:52:53 PM
Rare 15.7%
Bridge Building
Complete all test chambers in the Hard-Light Surfaces co-op course
1/6/2012
6:24:00 PM
Rare 20.6%
Portal Conservation Society
Complete Chamber 3 in the Hard-Light Surfaces co-op course using only 5 total portal placements
1/6/2012
6:03:37 PM
Ultra Rare 2.1%
Can't Touch This
Dance in front of a turret blocked by a hard light bridge in co-op
1/5/2012
6:15:02 PM
Very Rare 7.9%
Narbacular Drop
Place a portal under your co-op partner while they are gesturing
1/5/2012
5:03:04 PM
Very Rare 5.5%
Confidence Building
Complete all test chambers in the Mass and Velocity co-op course
1/5/2012
5:01:12 PM
Rare 31.6%
Team Building
Complete all test chambers in the Team Building co-op course
1/5/2012
3:30:34 PM
Rare 46.8%
