Portal 2 achievements
905
(510)

Portal 2

4.6 from 431 votes

There are a maximum of 51 Portal 2 achievements worth 905

9,965 tracked gamers have this game, 643 have completed it (6.45%)

Achievement Details

Preservation of Mass in Portal 2

Preservation of Mass14

Break the rules in Test Chamber 07

  • Unlocked by 5,412 tracked gamers (54% - TSA Ratio = 1.36) 10,075  
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