Portal 2 achievements
915
(510)

Portal 2

4.6 from 348 votes

There are a maximum of 51 Portal 2 achievements worth 915

8,537 tracked gamers have this game, 522 have completed it (6.11%)

Achievement Details

Preservation of Mass in Portal 2

Preservation of Mass14

Break the rules in Test Chamber 07

  • Unlocked by 4,541 tracked gamers (53% - TSA Ratio = 1.36) 8,537  
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