| Achievement | How to unlock
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| Air Show ( 20 points ) | Perform 2 aerial gestures before touching the ground in co-op.
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| Asking for Trouble ( 10 points ) | Taunt GLaDOS in front of a camera in each of the five co-op courses.
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| Bridge Building ( 15 points ) | Complete all test chambers in the Hard-Light Surfaces co-op course.
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| Bridge Over Troubling Water ( 10 points ) | Complete the first Hard Light Bridge test.
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| Can't Touch This ( 10 points ) | Dance in front of a turret blocked by a hard light bridge in co-op.
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| Confidence Building ( 10 points ) | Complete all test chambers in the Mass and Velocity co-op course.
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| Door Prize ( 20 points ) | Examine all the vitrified test chamber doors.
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| Drop Box ( 20 points ) | Place a cube on a button without touching the cube.
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| Dual Pit Experiment ( 15 points ) | Do the same test twice.
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| Empty Gesture ( 25 points ) | Drop your co-op partner in goo while they are gesturing by removing the bridge under them.
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| Final Transmission ( 20 points ) | Find the hidden signal in one of the Rat Man's dens.
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| Four Ring Circus ( 25 points ) | Enter 4 different portals without touching the ground in co-op.
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| Friends List With Benefits ( 50 points ) | While playing co-op, hug 3 different people on your friends list.
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| Gesticul-8 ( 15 points ) | Perform all 8 gestures of your own volition in co-op.
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| Good Listener ( 5 points ) | Take GLaDOS' escape advice.
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| High Five ( 5 points ) | Celebrate your cooperative calibration success.
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| Iron Grip ( 20 points ) | Never lose a cube in Chamber 6 of the Mass and Velocity co-op course.
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| Lunacy ( 20 points ) | That just happened.
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| Narbacular Drop ( 25 points ) | Place a portal under your co-op partner while they are gesturing.
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| No Hard Feelings ( 10 points ) | Save a turret from redemption.
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| Obstacle Building ( 15 points ) | Complete all test chambers in the Excursion Funnels co-op course.
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| Overclocker ( 30 points ) | Complete Test Chamber 10 in 70 seconds.
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| Party of Three ( 25 points ) | Find the hidden companion cube in co-op test chamber.
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| Pit Boss ( 30 points ) | Show that pit who's boss.
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| Portal Conservation Society ( 20 points ) | 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 ( 10 points ) | Find a hidden portrait.
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| Preservation of Mass ( 20 points ) | Break the rules in Test Chamber 07.
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| Professor Portal ( 75 points ) | After completing co-op, complete Calibration Course online with a friend who hasn’t played before.
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| Pturretdactyl ( 5 points ) | Use an Aerial Faith Plate to launch a turret.
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| Rock Portal Scissors ( 20 points ) | Win 3 co-op games of rock-paper-scissors in a row.
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| SaBOTour ( 10 points ) | Make a break for it.
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| Scanned Alone ( 5 points ) | Stand in a defective turret detector.
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| Schrodinger's Catch ( 20 points ) | Catch a blue-painted box before it touches the ground.
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| Ship Overboard ( 10 points ) | Discover the missing experiment.
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| Smash TV ( 75 points ) | Break 11 test chamber monitors.
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| Stalemate Associate ( 15 points ) | Press the button!.
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| Still Alive ( 15 points ) | Complete Course 4 with neither you nor your co-op partner dying.
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| Stranger Than Friction ( 15 points ) | Master the Propulsion Gel.
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| Tater Tote ( 15 points ) | Carry science forward.
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| Team Building ( 10 points ) | Complete all test chambers in the Team Building co-op course.
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| The Part Where He Kills You ( 20 points ) | This is that part.
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| Triple Crown ( 15 points ) | Solve 3 co-op chambers in the Mass and Velocity course in under 60 seconds each.
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| Tunnel of Funnel ( 15 points ) | Master the Excursion Funnel.
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| Undiscouraged ( 10 points ) | Complete the first Thermal Discouragement Beam test.
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| Vertically Unchallenged ( 15 points ) | Master the Repulsion Gel.
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| Wake Up Call ( 5 points ) | Survive the manual override.
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| White Out ( 15 points ) | Complete the first Conversion Gel test.
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| You Made Your Point ( 10 points ) | Refuse to solve the first test in Chapter 8.
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| You Monster ( 5 points ) | Reunite with GLaDOS.
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| You Saved Science ( 100 points ) | Complete all test chambers in all courses of co-op.
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