Portal 2 achievements
911
(510)

Portal 2

4.6 from 329 votes

There are a maximum of 51 Portal 2 achievements worth 911

7,983 tracked gamers have this game, 493 have completed it (6.18%)

Achievement Details

Preservation of Mass in Portal 2

Preservation of Mass14

Break the rules in Test Chamber 07

  • Unlocked by 4,310 tracked gamers (54% - TSA Ratio = 1.35) 7,983  
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