Portal 2 achievements
917
(510)

Portal 2

4.6 from 359 votes

There are a maximum of 51 Portal 2 achievements worth 917

8,792 tracked gamers have this game, 544 have completed it (6.19%)

Achievement Details

Preservation of Mass in Portal 2

Preservation of Mass14

Break the rules in Test Chamber 07

  • Unlocked by 4,725 tracked gamers (53% - TSA Ratio = 1.37) 8,948  
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