Achievement Unlocked Visibility Global Unlocks
Professor Portal
After completing co-op, complete Calibration Course online with a friend who hasn’t played before 		2019-12-22 13:23:47 5.8%
Triple Crown
Solve 3 co-op chambers in the Mass and Velocity course in under 60 seconds each 		2019-12-08 17:50:46 3.0%
Still Alive
Complete Course 4 with neither you nor your co-op partner dying 		2019-12-05 12:17:16 2.4%
Talent Show
Never lose a cube in Chamber 6 of the Mobility Gels co-op course 		2019-12-04 12:29:11 2.6%
Iron Grip
Never lose a cube in Chamber 6 of the Mass and Velocity co-op course 		2019-12-04 10:44:48 3.6%
Portal Conservation Society
Complete Chamber 3 in the Hard-Light Surfaces co-op course using only 5 total portal placements 		2019-12-01 19:19:41 2.7%
Asking for Trouble
Taunt GLaDOS in front of a camera in each of the five co-op courses 		2019-12-01 18:51:35 9.1%
Four Ring Circus
Enter 4 different portals without touching the ground in co-op 		2019-12-01 18:50:43 6.9%
Smash TV
Break 11 test chamber monitors 		2018-10-23 13:27:10 3.7%
Friends List With Benefits
While playing co-op, hug 3 different people on your friends list 		2018-01-11 07:55:49 4.4%
You Saved Science
Complete all test chambers in all courses of co-op 		2017-12-18 11:42:30 21.3%
Narbacular Drop
Place a portal under your co-op partner while they are gesturing 		2017-12-11 13:22:17 5.9%
Obstacle Building
Complete all test chambers in the Excursion Funnels co-op course 		2017-12-11 13:17:08 26.5%
Party of Three
Find the hidden companion cube in co-op test chamber 		2017-12-11 13:14:53 3.6%
Gesticul-8
Perform all 8 gestures of your own volition in co-op 		2017-12-11 12:02:45 27.3%
Bridge Building
Complete all test chambers in the Hard-Light Surfaces co-op course 		2017-12-11 11:31:57 32.2%
Can't Touch This
Dance in front of a turret blocked by a hard light bridge in co-op 		2017-12-11 10:55:42 10.0%
Empty Gesture
Drop your co-op partner in goo while they are gesturing by removing the bridge under them 		2017-12-11 10:23:21 4.6%
Rock Portal Scissors
Win 3 co-op games of rock-paper-scissors in a row 		2017-12-11 10:10:26 9.9%
Air Show
Perform 2 aerial gestures before touching the ground in co-op 		2017-12-11 09:12:53 33.9%
Overclocker
Complete Test Chamber 10 in 70 seconds 		2017-12-09 22:42:40 4.0%
Good Listener
Take GLaDOS' escape advice 		2017-12-08 20:38:16 29.3%
Pit Boss
Show that pit who's boss 		2017-12-08 20:08:43 8.0%
Final Transmission
Find the hidden signal in one of the Rat Man's dens 		2017-12-07 13:42:46 5.7%
Pturretdactyl
Use an Aerial Faith Plate to launch a turret 		2017-12-07 13:40:53 9.1%
Schrodinger's Catch
Catch a blue-painted box before it touches the ground 		2017-12-07 12:41:33 7.0%
Door Prize
Examine all the vitrified test chamber doors 		2017-12-07 07:57:16 7.5%
Ship Overboard
Discover the missing experiment 		2017-12-07 07:56:42 11.0%
Portrait of a Lady
Find a hidden portrait 		2017-12-06 19:50:42 12.1%
Preservation of Mass
Break the rules in Test Chamber 07 		2017-12-06 16:26:23 25.1%
You Made Your Point
Refuse to solve the first test in Chapter 8 		2017-12-06 15:48:50 6.8%
No Hard Feelings
Save a turret from redemption 		2017-12-06 15:27:26 31.9%
Lunacy
That just happened 		2015-03-08 15:19:32 35.3%
The Part Where He Kills You
This is that part 		2015-03-08 12:51:20 35.6%
Tunnel of Funnel
Master the Excursion Funnel 		2015-03-05 20:05:18 36.3%
Confidence Building
Complete all test chambers in the Mass and Velocity co-op course 		2015-03-03 20:41:01 41.1%
Team Building
Complete all test chambers in the Team Building co-op course 		2015-03-03 19:42:22 49.6%
Dual Pit Experiment
Do the same test twice 		2015-03-01 15:29:16 38.3%
White Out
Complete the first Conversion Gel test 		2015-03-01 14:57:05 39.6%
Stranger Than Friction
Master the Propulsion Gel 		2015-03-01 14:37:43 40.8%
Tater Tote
Carry science forward 		2015-03-01 11:49:20 42.4%
Vertically Unchallenged
Master the Repulsion Gel 		2015-03-01 11:28:22 44.4%
Stalemate Associate
Press the button! 		2015-02-28 15:35:13 47.1%
Scanned Alone
Stand in a defective turret detector 		2015-02-28 15:19:24 35.8%
SaBOTour
Make a break for it 		2015-02-25 19:04:33 48.1%
Bridge Over Troubling Water
Complete the first Hard Light Bridge test 		2015-02-17 17:45:20 55.1%
Drop Box
Place a cube on a button without touching the cube 		2015-02-17 16:49:55 29.7%
Undiscouraged
Complete the first Thermal Discouragement Beam test 		2015-02-17 16:36:24 64.6%
You Monster
Reunite with GLaDOS 		2015-02-17 16:31:36 66.6%
Wake Up Call
Survive the manual override 		2015-02-17 16:05:20 75.9%
High Five
Celebrate your cooperative calibration success 		2015-02-16 19:26:09 58.8%