Bronze Air ShowPerform 2 aerial gestures before touching the ground in co-op
Bronze Asking for TroubleTaunt GLaDOS in front of a camera in each of the five co-op courses
Bronze Bridge BuildingComplete all test chambers in the Hard-Light Surfaces co-op course
Bronze Bridge Over Troubling WaterComplete the first Hard-Light Surfaces test
Bronze Can't Touch ThisDance in front of a turret blocked by a hard light bridge in co-op
Bronze Confidence BuildingComplete all test chambers in the Mass and Velocity co-op course
Bronze Door PrizeExamine all the vitrified test chamber doors
Bronze Dual Pit ExperimentDo the same test twice
Bronze Empty GestureDrop your co-op partner in goo while they are gesturing by removing the bridge under them
Bronze Final TransmissionFind the hidden signal in one of the Rat Man's dens
Bronze Four Ring CircusEnter 4 different portals without touching the ground in co-op
Bronze Gesticul-8Perform all 8 gestures of your own volition in co-op
Bronze Good ListenerTake GLaDOS' escape advice
Bronze High FiveCelebrate your cooperative calibration success
Bronze Iron GripNever lose a cube in Chamber 6 of the Mass and Velocity co-op course
Bronze No Hard FeelingsSave a turret from redemption
Bronze Obstacle BuildingComplete all test chambers in the Excursion Funnels co-op course
Bronze Party of ThreeFind the hidden companion cube in co-op test chamber
Bronze Pit BossShow that pit who's boss
Bronze Portal Conservation SocietyComplete Chamber 3 in the Hard-Light Surfaces co-op course using only 5 total portal placements
Bronze Portrait of a LadyFind a hidden portrait
Bronze Preservation of MassBreak the rules in Test Chamber 07
Bronze PturretdactylUse an Aerial Faith Plate to launch a turret
Bronze SaBOTourMake a break for it
Bronze Scanned AloneStand in a defective turret detector
Bronze Schrodinger's CatchCatch a blue-painted box before it touches the ground
Bronze Ship OverboardDiscover the missing experiment
Bronze Smash TVBreak 11 test chamber monitors
Bronze Stalemate AssociatePress the button!
Bronze Still AliveComplete Course 4 with neither you nor your co-op partner dying
Bronze Stranger Than FrictionMaster the Propulsion Gel
Bronze Tater ToteCarry science forward
Bronze Team BuildingComplete all test chambers in the Team Building co-op course
Bronze The Part Where He Kills YouThis is that part
Bronze Triple CrownSolve 3 co-op chambers in the Mass and Velocity course in under 60 seconds each
Bronze Tunnel of FunnelMaster the Excursion Funnel
Bronze UndiscouragedComplete the first Thermal Discouragement Beam test
Bronze Vertically UnchallengedMaster the Repulsion Gel
Bronze Wake Up CallSurvive the manual override
Bronze White OutComplete the first Conversion Gel test
Bronze You Made Your PointRefuse to solve the first test in Chapter 8
Bronze You MonsterReunite with GLaDOS
Silver Drop BoxPlace a cube on a button without touching the cube
Silver Friends List With BenefitsWhile playing co-op, hug 3 different people on your friends list
Silver Narbacular DropPlace a portal under your co-op partner while they are gesturing
Silver OverclockerComplete Test Chamber 10 in 70 seconds
Silver Rock Portal ScissorsWin 3 co-op games of rock-paper-scissors in a row
Gold LunacyThat just happened
Gold Professor PortalAfter completing co-op, complete Calibration Course online with a friend who hasn’t played before
Gold You Saved ScienceComplete all test chambers in all courses of co-op
Platinum Portal 2 Platinum TrophyCollected all other Portal 2 trophies