Portal 2 > การสนทนาทั่วไป > รายละเอียดกระทู้
Legend_of_Link 12 มิ.ย. 2013 @ 5:35pm
Professor Portal Achievement Help
If you haven't done co-op in portal 2, please respond to this. I really would like to get that achievement. It doesn't matter if you've done single player or not. All that matters is you haven't done co-op.