There are 50 achievements for a total of 1000 Gamerscore points.
| Achievement | Description | |
| Pit Boss | 30 | Show that pit who’s boss |
| Preservation of Mass | 20 | Break the rules in Test Chamber 07 |
| Pturretdactyl | 5 | Use an Aerial Faith Plate to launch a turret |
| Lunacy | 20 | That just happened |
| Drop Box | 20 | Place a cube on a button without touching the cube |
| Overclocker | 30 | Complete Test Chamber 10 in 70 seconds |
| No Hard Feelings | 10 | Save a turret from redemption |
| Schrodinger’s Catch | 20 | Catch a blue-painted box before it touches the ground |
| Ship Overboard | 10 | Discover the missing experiment |
| Final Transmission | 20 | Find the hidden signal in one of the Rat Man’s dens |
| Good Listener | 5 | Take GLaDOS’ escape advice |
| Scanned Alone | 5 | Stand in a defective turret detector |
| The Part Where He Kills You | 20 | This is that part |
| Bridge Over Troubling Water | 10 | Complete the first Hard Light Bridge test |
| SaBOTour | 10 | Make a break for it |
| Stalemate Associate | 15 | Press the button! |
| Wake Up Call | 5 | Survive the manual override |
| You Monster | 5 | Reunite with GLaDOS |
| Undiscouraged | 10 | Complete the first Thermal Discouragement Beam test |
| White Out | 15 | Complete the first Conversion Gel test |
| Tunnel of Funnel | 15 | Master the Excursion Funnel |
| Dual Pit Experiment | 15 | Do the same test twice |
| Tater Tote | 15 | Carry science forward |
| Vertically Unchallenged | 15 | Master the Repulsion Gel |
| Stranger Than Friction | 15 | Master the Propulsion Gel |
| Professor Portal | 75 | After completing co-op, complete Calibration Course online with a friend who hasn’t played before |
| Air Show | 20 | Perform 2 aerial gestures before touching the ground in co-op |
| Portal Conservation Society | 20 | Complete Chamber 3 in the Hard-Light Surfaces co-op course using only 5 total portal placements |
| Empty Gesture | 25 | Drop your co-op partner in goo while they are gesturing by removing the bridge under them |
| Party of Three | 25 | Find the hidden companion cube in co-op test chamber |
| Narbacular Drop | 25 | Place a portal under your co-op partner while they are gesturing |
| Asking for Trouble | 10 | Taunt GLaDOS in front of a camera in each of the five co-op courses |
| Rock Portal Scissors | 20 | Win 3 co-op games of rock-paper-scissors in a row |
| Friends List With Benefits | 50 | While playing co-op, hug 3 different people on your friends list |
| Four Ring Circus | 25 | Enter 4 different portals without touching the ground in co-op |
| Triple Crown | 15 | Solve 3 co-op chambers in the Mass and Velocity course in under 60 seconds each |
| Still Alive | 15 | Complete Course 4 with neither you nor your co-op partner dying |
| Can’t Touch This | 10 | Dance in front of a turret blocked by a hard light bridge in co-op |
| Smash TV | 75 | Break 11 test chamber monitors |
| High Five | 5 | Celebrate your cooperative calibration success |
| Team Building | 10 | Complete all test chambers in the Team Building co-op course |
| Door Prize | 20 | Examine all the vitrified test chamber doors |
| Portrait of a Lady | 10 | Find a hidden portrait |
| You Made Your Point | 10 | Refuse to solve the first test in Chapter 8 |
| You Saved Science | 100 | Complete all test chambers in all courses of co-op |
| Iron Grip | 20 | Never lose a cube in Chamber 6 of the Mass and Velocity co-op course |
| Gesticul-8 | 15 | Perform all 8 gestures of your own volition in co-op |
| Confidence Building | 10 | Complete all test chambers in the Mass and Velocity co-op course |
| Bridge Building | 15 | Complete all test chambers in the Hard-Light Surfaces co-op course |
| Obstacle Building | 15 | Complete all test chambers in the Excursion Funnels co-op course |
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