I have completed co-op online and have the "You Saved Science" achievement. If I play with someone who has played offline co-op do I still get "Professor Portal"?


I believe they can't have played co-op at all; the point is for you, as Professor Portal, to teach them how to play co-op (so online/offline is irrelevant). See this for confirmation: http://www.xbox360achievements.org/game/portal-2/achievement/51218-Professor-Portal.html#56

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