Professor Portal
After completing co-op, complete Calibration Course online with a friend who hasn’t played before
6/4/2011
8:45:26 PM
Ultra Rare 1.7%
Still Alive
Complete Course 4 with neither you nor your co-op partner dying
6/2/2011
4:41:37 PM
Ultra Rare 1.4%
Asking for Trouble
Taunt GLaDOS in front of a camera in each of the five co-op courses
6/2/2011
4:47:29 AM
Very Rare 6.0%
Four Ring Circus
Enter 4 different portals without touching the ground in co-op
6/2/2011
4:40:14 AM
Ultra Rare 4.6%
Portal Conservation Society
Complete Chamber 3 in the Hard-Light Surfaces co-op course using only 5 total portal placements
6/2/2011
4:37:01 AM
Ultra Rare 2.1%
Triple Crown
Solve 3 co-op chambers in the Mass and Velocity course in under 60 seconds each
6/2/2011
3:45:26 AM
Ultra Rare 1.8%
Narbacular Drop
Place a portal under your co-op partner while they are gesturing
6/2/2011
3:04:06 AM
Very Rare 5.5%
Iron Grip
Never lose a cube in Chamber 6 of the Mass and Velocity co-op course
6/2/2011
3:01:29 AM
Ultra Rare 2.8%
Empty Gesture
Drop your co-op partner in goo while they are gesturing by removing the bridge under them
6/2/2011
1:00:44 AM
Ultra Rare 3.9%
Obstacle Building
Complete all test chambers in the Excursion Funnels co-op course
6/2/2011
12:39:40 AM
Rare 15.7%
Can't Touch This
Dance in front of a turret blocked by a hard light bridge in co-op
6/2/2011
12:24:02 AM
Very Rare 7.9%
Brothers In Arms
Split screen Co-Op - Segomo – Get 3 minutes of continuous Co-Op weapon boost
6/1/2011
10:52:47 PM
Ultra Rare 1.3%
Schrodinger's Catch
Catch a blue-painted box before it touches the ground
6/1/2011
1:21:14 PM
Very Rare 6.9%
