Portal 2 achievements
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Portal 2

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There are 50 Portal 2 achievements worth 1,704 (1,000)

126,407 tracked gamers have this game, 12,355 have completed it (9.77%)

Achievement Details

Confidence Building in Portal 2

Confidence Building13 (10)

Complete all test chambers in the Mass and Velocity co-op course

  • Unlocked by 75,992 tracked gamers (60% - TA Ratio = 1.28) 126,411  

Achievement Guide for Confidence Building

AuthorSolution
APOPHIS1989
322,417 (196,265)
APOPHIS1989
Achievement won on 21 Apr 11
TA Score for this game: 1,664
Posted on 21 April 11 at 13:01
This solution has 14 positive votes and 0 negative votes. Please log in to vote.
These are the second set of co-op chambers to complete. They are fairly straightforward, with the classic Portal feel to them. Most involve a cube or similar object and launching platforms. Good communication with your partner is a big help.
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