| Trophy | How to unlock
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| Air Show (Bronze) | Perform 2 aerial gestures before touching the ground in co-op.
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| Asking for Trouble (Bronze) | Taunt GLaDOS in front of a camera in each of the five co-op courses.
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| Bridge Building (Bronze) | Complete all test chambers in the Hard-Light Surfaces co-op course.
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| Bridge Over Troubling Water (Bronze) | Complete the first Hard-Light Surfaces test.
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| Can't Touch This (Bronze) | Dance in front of a turret blocked by a hard light bridge in co-op.
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| Confidence Building (Bronze) | Complete all test chambers in the Mass and Velocity co-op course.
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| Door Prize (Bronze) | Examine all the vitrified test chamber doors.
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| Drop Box (Silver) | Place a cube on a button without touching the cube.
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| Dual Pit Experiment (Bronze) | Do the same test twice.
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| Empty Gesture (Bronze) | Drop your co-op partner in goo while they are gesturing by removing the bridge under them.
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| Final Transmission (Bronze) | Find the hidden signal in one of the Rat Man's dens.
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| Four Ring Circus (Bronze) | Enter 4 different portals without touching the ground in co-op.
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| Friends List With Benefits (Silver) | While playing co-op, hug 3 different people on your friends list.
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| Gesticul-8 (Bronze) | Perform all 8 gestures of your own volition in co-op.
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| Good Listener (Bronze) | Take GLaDOS' escape advice.
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| High Five (Bronze) | Celebrate your cooperative calibration success.
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| Iron Grip (Bronze) | Never lose a cube in Chamber 6 of the Mass and Velocity co-op course.
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| Lunacy (Gold) | That just happened.
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| Narbacular Drop (Silver) | Place a portal under your co-op partner while they are gesturing.
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| No Hard Feelings (Bronze) | Save a turret from redemption.
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| Obstacle Building (Bronze) | Complete all test chambers in the Excursion Funnels co-op course.
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| Overclocker (Silver) | Complete Test Chamber 10 in 70 seconds.
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| Party of Three (Bronze) | Find the hidden companion cube in co-op test chamber.
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| Pit Boss (Bronze) | Show that pit who's boss.
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| Portal 2 Platinum Trophy (Platinum) | Collected all other Portal 2 trophies.
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| Portal Conservation Society (Bronze) | Complete Chamber 3 in the Hard-Light Surfaces co-op course using only 5 total portal placements.
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| Portrait of a Lady (Bronze) | Find a hidden portrait.
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| Preservation of Mass (Bronze) | Break the rules in Test Chamber 07.
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| Professor Portal (Gold) | After completing co-op, complete Calibration Course online with a friend who hasn’t played before.
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| Pturretdactyl (Bronze) | Use an Aerial Faith Plate to launch a turret.
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| Rock Portal Scissors (Silver) | Win 3 co-op games of rock-paper-scissors in a row.
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| SaBOTour (Bronze) | Make a break for it.
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| Scanned Alone (Bronze) | Stand in a defective turret detector.
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| Schrodinger's Catch (Bronze) | Catch a blue-painted box before it touches the ground.
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| Ship Overboard (Bronze) | Discover the missing experiment.
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| Smash TV (Bronze) | Break 11 test chamber monitors.
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| Stalemate Associate (Bronze) | Press the button!
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| Still Alive (Bronze) | Complete Course 4 with neither you nor your co-op partner dying.
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| Stranger Than Friction (Bronze) | Master the Propulsion Gel.
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| Tater Tote (Bronze) | Carry science forward.
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| Team Building (Bronze) | Complete all test chambers in the Team Building co-op course.
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| The Part Where He Kills You (Bronze) | This is that part.
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| Triple Crown (Bronze) | Solve 3 co-op chambers in the Mass and Velocity course in under 60 seconds each.
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| Tunnel of Funnel (Bronze) | Master the Excursion Funnel.
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| Undiscouraged (Bronze) | Complete the first Thermal Discouragement Beam test.
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| Vertically Unchallenged (Bronze) | Master the Repulsion Gel.
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| Wake Up Call (Bronze) | Survive the manual override.
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| White Out (Bronze) | Complete the first Conversion Gel test.
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| You Made Your Point (Bronze) | Refuse to solve the first test in Chapter 8.
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| You Monster (Bronze) | Reunite with GLaDOS.
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| You Saved Science (Gold) | Complete all test chambers in all courses of co-op.
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