Obstacle Building
Complete all test chambers in the Excursion Funnels co-op course
4/26/2011
3:01:32 AM
Rare 15.7%
Bridge Building
Complete all test chambers in the Hard-Light Surfaces co-op course
4/25/2011
8:28:53 AM
Rare 20.6%
Can't Touch This
Dance in front of a turret blocked by a hard light bridge in co-op
4/25/2011
7:25:31 AM
Very Rare 7.9%
Portal Conservation Society
Complete Chamber 3 in the Hard-Light Surfaces co-op course using only 5 total portal placements
4/25/2011
6:49:40 AM
Ultra Rare 2.1%
Four Ring Circus
Enter 4 different portals without touching the ground in co-op
4/25/2011
6:30:03 AM
Ultra Rare 4.6%
Empty Gesture
Drop your co-op partner in goo while they are gesturing by removing the bridge under them
4/25/2011
6:11:34 AM
Ultra Rare 3.9%
Narbacular Drop
Place a portal under your co-op partner while they are gesturing
4/25/2011
6:07:52 AM
Very Rare 5.5%
Confidence Building
Complete all test chambers in the Mass and Velocity co-op course
4/24/2011
11:55:35 PM
Rare 31.6%
Schrodinger's Catch
Catch a blue-painted box before it touches the ground
4/24/2011
10:05:38 PM
Very Rare 6.9%
Final Transmission
Find the hidden signal in one of the Rat Man's dens
4/24/2011
6:50:50 AM
Very Rare 7.7%
