Portal 2 achievements

Portal 2

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There are a maximum of 50 Portal 2 achievements worth 1,677 (1,000)

115,767 tracked gamers have this game, 11,906 have completed it (10.28%)

Achievement Details

Professor Portal in Portal 2

Professor Portal189 (75)

This is a rare achievementAfter completing co-op, complete Calibration Course online with a friend who hasn’t played before

  • Unlocked by 18,177 tracked gamers (16% - TA Ratio = 2.51) 115,767  

Achievement Guide for Professor Portal

146,445 (90,248)
Achievement won on 20 Apr 11
TA Score for this game: 1,677
Posted on 20 April 11 at 06:53, Edited on 30 January 12 at 19:13
This solution has 74 positive votes and 5 negative votes. Please log in to vote.
Just a few tips to make sure you get this and don't disqualify you or your friends from this achievement
-One player must have beaten the entire Co-op before and one player must have never done the tutorial.
-The player who has never done the tutorial must never been in a chamber, the central hub is fine.
-Single player does not affect this, so you can have played the whole single player and it won't affect this.
-If you are going for other achievements, such as Friends list with benefits or other similiar co-op ones, skip the tutorial by pausing during the opening cutscene and returning to the hub.
-This cannot be done split-screen, must be two players with Active X-box Live accounts
-The only required chamber is the tutorial chamber where you acquire the gun and calibrate weight variances, which can really upset humans if you bring up :)

Hope this helps.
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