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