Author Topic: How to earn the Preservation of Mass achievement in Portal 2 for Xbox 360  (Read 1208 times)

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February 08, 2012, 11:03:45 am

Offline FRT

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How to earn the Preservation of Mass achievement in Portal 2 for Xbox 360

Got your eye on that Preservation of Mass achievement in Portal 2 for Xbox 360? This is the video that will show you exactly what to do to get it. Watch this guide and learn what you need to know to raise your Gamerscore.


Portal 2 - Preservation Of Mass Achievement Guide

<a href="http://www.youtube.com/watch?v=bNdLr3ZzeJI" target="_blank">http://www.youtube.com/watch?v=bNdLr3ZzeJI</a>