Hard Finish
Finish story mode on Hard, without changing the difficulty setting.
6/5/2011
5:46:05 AM
Very Rare 6.6%
Evil to the Core
Purchase every negative Karma upgrade for each power.
6/5/2011
1:11:21 AM
Very Rare 5.1%
Asking for Trouble
Taunt GLaDOS in front of a camera in each of the five co-op courses
5/10/2011
12:07:19 AM
Very Rare 6.0%
Obstacle Building
Complete all test chambers in the Excursion Funnels co-op course
5/10/2011
12:03:48 AM
Rare 15.7%
Bridge Building
Complete all test chambers in the Hard-Light Surfaces co-op course
5/6/2011
5:20:27 AM
Rare 20.6%
Four Ring Circus
Enter 4 different portals without touching the ground in co-op
5/6/2011
4:25:29 AM
Ultra Rare 4.6%
Iron Grip
Never lose a cube in Chamber 6 of the Mass and Velocity co-op course
5/6/2011
4:17:55 AM
Ultra Rare 2.8%
Schrodinger's Catch
Catch a blue-painted box before it touches the ground
5/6/2011
2:20:02 AM
Very Rare 6.9%