Portal 2 achievements
961
(510)

Portal 2

4.7 from 267 votes

There are a maximum of 51 Portal 2 achievements worth 961

6,818 tracked gamers have this game, 362 have completed it (5.31%)

Achievement Details

Confidence Building in Portal 2

Confidence Building14

Complete all test chambers in the Mass and Velocity co-op course

  • Unlocked by 3,269 tracked gamers (48% - TSA Ratio = 1.44) 6,818  
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