1. Portal 2 Achievements
  2. Preservation of Mass achievement
Portal 2

Portal 2

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Portal 2
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202
17
20 Jul 17
6h 53m
34%
Azerom

Preservation of Mass achievement in Portal 2

Preservation of Mass

Break the rules in Test Chamber 07

Preservation of Mass0
20 July 2017 - 1 guideOffline Mode - These achievements require play in game modes that do not necessitate a connection to any online services.Single Player - These achievements can be obtained by a single player.
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How to unlock the Preservation of Mass achievement

  • ShenronShenron129,925
    14 Aug 2015 20 Feb 2022 20 Feb 2022

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