Portal 2 achievements
959
(510)

Portal 2

4.7 from 245 votes

There are a maximum of 51 Portal 2 achievements worth 959

6,354 tracked gamers have this game, 337 have completed it (5.30%)

Achievement Details

Preservation of Mass in Portal 2

Preservation of Mass14

Break the rules in Test Chamber 07

  • Unlocked by 3,134 tracked gamers (49% - TSA Ratio = 1.42) 6,354  
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