If you didn't pass 5000 portals in your career and want to catch up some portal passings, check out and convoy run the following chambers: Chamber 43 (112 passes in total), chamber 57 (96 passes in total), Chamber 48 (60 passes in total) or Chamber 30 (48 passes in total). Be aware of this achievement won't pop up, so you have to leave the level to eventually get it.