“Professor Portal” achievement in Portal 2

I achieved almost all of Portal 2 achievements, except “Still Alive” and “Professor Portal”. The first one is not a big problem but second one is, since my steam friends who have Portal 2 have already played co-op.

One way to achieve this is to play with random player and become their friend, however, I’m wonder if becoming friends after starting the calibration course is still accepted.

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    PS : sorry, I can’t decide the answer until saturday because I can’t confirm until then… 🙁

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  • 2 Solutions collect form web for ““Professor Portal” achievement in Portal 2”

    No, it’s not ok, I tried several times. And the time I did get the achievement was when I added the guy to friends list before I started the game with him.


    I previously stated that it was not necessary to be friends with your co-op partner. This is however false information.

    EDIT: You get the achievement at the end of the track when the confetti falls from the ceiling. If your co-op buddy is in your friend-list by that time you will get the achievement. So it’s all good to add your co-op partner as a friend during the course.

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