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