| Achievement | How to unlock
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| - 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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| - Examine all the vitrified test chamber doors.
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| - Place a cube on a button without touching the cube.
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- Dual Pit Experiment ( 15 points )
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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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| - 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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| - Celebrate your cooperative calibration success.
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| - Never lose a cube in Chamber 6 of the Mass and Velocity co-op course.
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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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| - 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 )
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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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- 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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| - Break 11 test chamber monitors.
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- Stalemate Associate ( 15 points )
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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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- 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 )
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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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| - 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 Saved Science ( 100 points )
| - Complete all test chambers in all courses of co-op.
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