Wake Up Call
Survive the manual override
83.8%
You Monster
Reunite with GLaDOS
78.8%
Undiscouraged
Complete the first Thermal Discouragement Beam test
77.6%
Bridge Over Troubling Water
Complete the first Hard Light Bridge test
71.0%
SaBOTour
Make a break for it
65.2%
Stalemate Associate
Press the button!
64.3%
Vertically Unchallenged
Master the Repulsion Gel
61.8%
Tater Tote
Carry science forward
59.8%
Stranger Than Friction
Master the Propulsion Gel
58.3%
White Out
Complete the first Conversion Gel test
56.9%
Dual Pit Experiment
Do the same test twice
55.5%
High Five
Celebrate your cooperative calibration success
54.3%
Tunnel of Funnel
Master the Excursion Funnel
53.1%
The Part Where He Kills You
This is that part
52.2%
Lunacy
That just happened
51.7%
Scanned Alone
Stand in a defective turret detector
49.4%
Team Building
Complete all test chambers in the Team Building co-op course
45.3%
No Hard Feelings
Save a turret from redemption
39.9%
Good Listener
Take GLaDOS' escape advice
39.5%
Confidence Building
Complete all test chambers in the Mass and Velocity co-op course
37.7%
Drop Box
Place a cube on a button without touching the cube
36.2%
Preservation of Mass
Break the rules in Test Chamber 07
34.3%
Air Show
Perform 2 aerial gestures before touching the ground in co-op
31.9%
Bridge Building
Complete all test chambers in the Hard-Light Surfaces co-op course
30.1%
Gesticul-8
Perform all 8 gestures of your own volition in co-op
26.5%
Obstacle Building
Complete all test chambers in the Excursion Funnels co-op course
25.3%
You Saved Science
Complete all test chambers in all courses of co-op
20.7%
Portrait of a Lady
Find a hidden portrait
18.8%
Ship Overboard
Discover the missing experiment
16.2%
Can't Touch This
Dance in front of a turret blocked by a hard light bridge in co-op
13.4%
Pturretdactyl
Use an Aerial Faith Plate to launch a turret
12.7%
Rock Portal Scissors
Win 3 co-op games of rock-paper-scissors in a row
12.1%
You Made Your Point
Refuse to solve the first test in Chapter 8
11.9%
Door Prize
Examine all the vitrified test chamber doors
11.4%
Pit Boss
Show that pit who's boss
11.2%
Asking for Trouble
Taunt GLaDOS in front of a camera in each of the five co-op courses
10.9%
Final Transmission
Find the hidden signal in one of the Rat Man's dens
8.8%
Schrodinger's Catch
Catch a blue-painted box before it touches the ground
8.8%
Narbacular Drop
Place a portal under your co-op partner while they are gesturing
8.1%
Four Ring Circus
Enter 4 different portals without touching the ground in co-op
6.5%
Empty Gesture
Drop your co-op partner in goo while they are gesturing by removing the bridge under them
6.1%
Overclocker
Complete Test Chamber 10 in 70 seconds
5.6%
Smash TV
Break 11 test chamber monitors
4.6%
Party of Three
Find the hidden companion cube in co-op test chamber
4.5%
Professor Portal
After completing co-op, complete Calibration Course online with a friend who hasn’t played before
4.3%
Iron Grip
Never lose a cube in Chamber 6 of the Mass and Velocity co-op course
4.1%
Friends List With Benefits
While playing co-op, hug 3 different people on your friends list
3.0%
Triple Crown
Solve 3 co-op chambers in the Mass and Velocity course in under 60 seconds each
2.8%
Portal Conservation Society
Complete Chamber 3 in the Hard-Light Surfaces co-op course using only 5 total portal placements
2.8%
Still Alive
Complete Course 4 with neither you nor your co-op partner dying
1.8%
Talent Show
Never lose a cube in Chamber 6 of the Mobility Gels co-op course
1.7%
