Life Preserver
Increase your life total to 30 or more in single player, or 60 or more in Two-Headed Giant
6/24/2011
8:35:15 PM
Rare 35.2%
Iron Grip
Never lose a cube in Chamber 6 of the Mass and Velocity co-op course
6/18/2011
9:55:17 PM
Ultra Rare 2.8%
Triple Crown
Solve 3 co-op chambers in the Mass and Velocity course in under 60 seconds each
6/18/2011
9:33:27 PM
Ultra Rare 1.8%
Party of Three
Find the hidden companion cube in co-op test chamber
6/18/2011
9:19:32 PM
Ultra Rare 2.9%
Still Alive
Complete Course 4 with neither you nor your co-op partner dying
6/18/2011
9:10:35 PM
Ultra Rare 1.4%
Portal Conservation Society
Complete Chamber 3 in the Hard-Light Surfaces co-op course using only 5 total portal placements
6/18/2011
8:12:54 PM
Ultra Rare 2.1%
