[tutorial] how to do professor portal achievement in portal 2
Professor Portal: After completing co-op, complete Calibration Course online with a friend who hasn’t played before.
- Find a partner who is willing to reset his/hers stats.
- He/she has to do this in Portal 2: Go to Options - Keyboard/Mouse - Allow Developer Console
- Go to Options - Keyboard/Mouse - Edit Keys/Buttons - Miscellaneous - Toggle Developer Console
- Press "~" to open the console.
- Type: mp_mark_all_maps_incomplete
- Now, all he/she has to do is to host a game.