Professor Portal achievement in Portal 2

Professor Portal

After completing co-op, complete Calibration Course online with a friend who hasn’t played before

Professor Portal0
1 guideOnline Game ModeCooperativeViral

How to unlock the Professor Portal achievement

  • JarieSuicuneJarieSuicune11,077
    05 Aug 2021 05 Aug 2021
    0 0 0
    This is easily one of the most frustrating achievements of any game to try to get, due to its particular requirements.

    ---Requirements and unlocking---
    1) You must have already completely finished Co-op Mode.
    2) You must complete the Calibration Course (the very beginning of Co-op Mode) with someone who is already on your Steam Friend List who has not played the Co-op Mode at all. (As in, if they have entered Co-op Mode at all... it is impossible to get this achievement with them. Technically, they can have safely entered the hub, but if they have it's very likely they did more and are ineligible.)

    If you have met the requirements, you will automatically enter the Calibration Course when you start Co-op Mode with your friend and then unlock the achievement.

    ---Help section---
    Due to the stupid ease that this achievement can become practically impossible to get (by not being able to find some person to friend that HASN'T broken the second requirement because... why would they have the game and NOT have played it, right?), here is a trick that thankfully works for Steam players. (Not sure if this can work for Xbox at all, since, as far as I know, any second account will have to purchase both the game and Xbox Live... and then make sure you don't mess up. I never have been able to get this on my Xbox account and don't know anyone that I can get it with. Ugh.)

    1) You must have finished Co-op Mode already (obviously)
    2) Have a friend that also has Portal 2 in their own Steam library. (Since a game can not be accessed from a shared library by two players at the same time)
    3) Your friend makes a dummy account (which will have access to the game via Steam Family Library).
    4) FRIEND THE DUMMY ACCOUNT (If they aren't in your Steam Friend List before you start the game, it will not count and you'll have to use another dummy account.)
    5) You invite the now-friended dummy account to join your Co-op Mode so they can supply the "new player" position in the achievement.
    6) You then can do the same for your friend (assuming they haven't already unlocked the achievement.)

    -Credit: Thanks to the guide made by user "rapphaelfs" on the Steam Community (
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