You Saved Science
Complete all test chambers in all courses of co-op
100 ✓ February 22nd, 2014
Overclocker
Complete Test Chamber 10 in 70 seconds
30 ✓ December 28th, 2014
Pit Boss
Show that pit who's boss
30 ✓ December 28th, 2014
Empty Gesture
Drop your co-op partner in goo while they are gesturing by removing the bridge under them
25 ✓ February 22nd, 2014
Narbacular Drop
Place a portal under your co-op partner while they are gesturing
25 ✓ February 19th, 2014
Four Ring Circus
Enter 4 different portals without touching the ground in co-op
25 ✓ February 22nd, 2014
The Part Where He Kills You
This is that part
20 ✓ December 28th, 2014
Lunacy
That just happened
20 ✓ December 28th, 2014
Drop Box
Place a cube on a button without touching the cube
20 ✓ December 29th, 2014
Preservation of Mass
Break the rules in Test Chamber 07
20 ✓ December 28th, 2014
Final Transmission
Find the hidden signal in one of the Rat Man's dens
20 ✓ December 29th, 2014
Schrodinger's Catch
Catch a blue-painted box before it touches the ground
20 ✓ December 29th, 2014
Air Show
Perform 2 aerial gestures before touching the ground in co-op
20 ✓ February 22nd, 2014
Portal Conservation Society
Complete Chamber 3 in the Hard-Light Surfaces co-op course using only 5 total portal placements
20 ✓ February 22nd, 2014
Rock Portal Scissors
Win 3 co-op games of rock-paper-scissors in a row
20 ✓ March 3rd, 2014
White Out
Complete the first Conversion Gel test
15 ✓ December 28th, 2014
Tunnel of Funnel
Master the Excursion Funnel
15 ✓ December 28th, 2014
Dual Pit Experiment
Do the same test twice
15 ✓ December 28th, 2014
Bridge Building
Complete all test chambers in the Hard-Light Surfaces co-op course
15 ✓ February 20th, 2014
Obstacle Building
Complete all test chambers in the Excursion Funnels co-op course
15 ✓ February 22nd, 2014
Gesticul-8
Perform all 8 gestures of your own volition in co-op
15 ✓ February 21st, 2014
Stalemate Associate
Press the button!
15 ✓ December 28th, 2014
Tater Tote
Carry science forward
15 ✓ December 28th, 2014
Vertically Unchallenged
Master the Repulsion Gel
15 ✓ December 28th, 2014
Stranger Than Friction
Master the Propulsion Gel
15 ✓ December 28th, 2014
No Hard Feelings
Save a turret from redemption
10 ✓ December 28th, 2014
Ship Overboard
Discover the missing experiment
10 ✓ December 29th, 2014
Portrait of a Lady
Find a hidden portrait
10 ✓ December 29th, 2014
You Made Your Point
Refuse to solve the first test in Chapter 8
10 ✓ December 29th, 2014
Undiscouraged
Complete the first Thermal Discouragement Beam test
10 ✓ December 28th, 2014
Team Building
Complete all test chambers in the Team Building co-op course
10 ✓ February 19th, 2014
Confidence Building
Complete all test chambers in the Mass and Velocity co-op course
10 ✓ February 19th, 2014
Can't Touch This
Dance in front of a turret blocked by a hard light bridge in co-op
10 ✓ February 22nd, 2014
Bridge Over Troubling Water
Complete the first Hard Light Bridge test
10 ✓ December 28th, 2014
Asking for Trouble
Taunt GLaDOS in front of a camera in each of the five co-op courses
10 ✓ February 22nd, 2014
SaBOTour
Make a break for it
10 ✓ December 28th, 2014
Wake Up Call
Survive the manual override
5 ✓ December 27th, 2014
Pturretdactyl
Use an Aerial Faith Plate to launch a turret
5 ✓ December 29th, 2014
You Monster
Reunite with GLaDOS
5 ✓ December 27th, 2014
Good Listener
Take GLaDOS' escape advice
5 ✓ December 28th, 2014
Scanned Alone
Stand in a defective turret detector
5 ✓ December 29th, 2014
High Five
Celebrate your cooperative calibration success
5 ✓ February 19th, 2014
Smash TV
Break 11 test chamber monitors
75 
Professor Portal
After completing co-op, complete Calibration Course online with a friend who hasn’t played before
75 
Friends List With Benefits
While playing co-op, hug 3 different people on your friends list
50 
Party of Three
Find the hidden companion cube in co-op test chamber
25 
Door Prize
Examine all the vitrified test chamber doors
20 
Iron Grip
Never lose a cube in Chamber 6 of the Mass and Velocity co-op course
20 
Triple Crown
Solve 3 co-op chambers in the Mass and Velocity course in under 60 seconds each
15 
Still Alive
Complete Course 4 with neither you nor your co-op partner dying
15