Overclocker
Not unlocked yetComplete Test Chamber 10 in 70 seconds
Pit Boss
Not unlocked yetShow that pit who's boss
Preservation of Mass
Not unlocked yetBreak the rules in Test Chamber 07
Pturretdactyl
Not unlocked yetUse an Aerial Faith Plate to launch a turret
Final Transmission
Not unlocked yetFind the hidden signal in one of the Rat Man's dens
Good Listener
Not unlocked yetTake GLaDOS' escape advice
Scanned Alone
Not unlocked yetStand in a defective turret detector
No Hard Feelings
Not unlocked yetSave a turret from redemption
Schrodinger's Catch
Not unlocked yetCatch a blue-painted box before it touches the ground
Ship Overboard
Not unlocked yetDiscover the missing experiment
Door Prize
Not unlocked yetExamine all the vitrified test chamber doors
Portrait of a Lady
Not unlocked yetFind a hidden portrait
You Made Your Point
Not unlocked yetRefuse to solve the first test in Chapter 8
Smash TV
Not unlocked yetBreak 11 test chamber monitors
Iron Grip
Not unlocked yetNever lose a cube in Chamber 6 of the Mass and Velocity co-op course
Can't Touch This
Not unlocked yetDance in front of a turret blocked by a hard light bridge in co-op
Empty Gesture
Not unlocked yetDrop your co-op partner in goo while they are gesturing by removing the bridge under them
Party of Three
Not unlocked yetFind the hidden companion cube in co-op test chamber
Narbacular Drop
Not unlocked yetPlace a portal under your co-op partner while they are gesturing
Professor Portal
Not unlocked yetAfter completing co-op, complete Calibration Course online with a friend who hasn’t played before
Portal Conservation Society
Not unlocked yetComplete Chamber 3 in the Hard-Light Surfaces co-op course using only 5 total portal placements
Triple Crown
Not unlocked yetSolve 3 co-op chambers in the Mass and Velocity course in under 60 seconds each
Still Alive
Not unlocked yetComplete Course 4 with neither you nor your co-op partner dying
Asking for Trouble
Not unlocked yetTaunt GLaDOS in front of a camera in each of the five co-op courses