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