Friends List With Benefits
While playing co-op, hug 3 different people on your friends list
5/17/2011
4:59:26 AM
Ultra Rare 1.4%
Professor Portal
After completing co-op, complete Calibration Course online with a friend who hasn’t played before
5/17/2011
4:59:08 AM
Ultra Rare 1.7%
Triple Crown
Solve 3 co-op chambers in the Mass and Velocity course in under 60 seconds each
5/17/2011
1:18:15 AM
Ultra Rare 1.8%
Empty Gesture
Drop your co-op partner in goo while they are gesturing by removing the bridge under them
5/2/2011
4:50:51 AM
Ultra Rare 3.9%
Four Ring Circus
Enter 4 different portals without touching the ground in co-op
5/2/2011
4:46:20 AM
Ultra Rare 4.6%
Asking for Trouble
Taunt GLaDOS in front of a camera in each of the five co-op courses
5/2/2011
4:40:28 AM
Very Rare 6.0%
Portal Conservation Society
Complete Chamber 3 in the Hard-Light Surfaces co-op course using only 5 total portal placements
5/2/2011
3:58:48 AM
Ultra Rare 2.1%
Iron Grip
Never lose a cube in Chamber 6 of the Mass and Velocity co-op course
5/2/2011
3:38:07 AM
Ultra Rare 2.8%
Still Alive
Complete Course 4 with neither you nor your co-op partner dying
5/2/2011
1:26:03 AM
Ultra Rare 1.4%
Can't Touch This
Dance in front of a turret blocked by a hard light bridge in co-op
5/1/2011
10:54:34 PM
Very Rare 7.9%