Portal 2
Xbox 360
- 1,649,747 Achievements Earned
- 86,463 Players Tracked
- 50 Total Achievements
- 7,567 Obtainable EXP
- 1,000 Gamerscore
- 5,125 100% Club
Solve 3 co-op chambers in the Mass and Velocity course in under 60 seconds each
15
10.49%
Very Rare - 379.00 EXP
You have not earned this achievement yet
Log in to view progress