Celebrate your cooperative calibration success
Complete all test chambers in the Team Building co-op course
Complete all test chambers in the Mass and Velocity co-op course
Master the Excursion Funnel
This is that part
That just happened
Complete the first Conversion Gel test
Do the same test twice
Find a hidden portrait
Carry science forward
Master the Propulsion Gel
Survive the manual override
Place a cube on a button without touching the cube
Break the rules in Test Chamber 07
Reunite with GLaDOS
Save a turret from redemption
Complete the first Thermal Discouragement Beam test
Complete the first Hard Light Bridge test
Make a break for it
Press the button!
Master the Repulsion Gel
Complete Test Chamber 10 in 70 seconds
Show that pit who's boss
Use an Aerial Faith Plate to launch a turret
Find the hidden signal in one of the Rat Man's dens
Take GLaDOS' escape advice
Stand in a defective turret detector
Catch a blue-painted box before it touches the ground
Discover the missing experiment
Examine all the vitrified test chamber doors
Refuse to solve the first test in Chapter 8
Break 11 test chamber monitors
Complete all test chambers in the Hard-Light Surfaces co-op course
Complete all test chambers in the Excursion Funnels co-op course
Complete all test chambers in all courses of co-op
Never lose a cube in Chamber 6 of the Mass and Velocity co-op course
Perform all 8 gestures of your own volition in co-op
Dance in front of a turret blocked by a hard light bridge in co-op
Drop your co-op partner in goo while they are gesturing by removing the bridge under them
Find the hidden companion cube in co-op test chamber
Place a portal under your co-op partner while they are gesturing
After completing co-op, complete Calibration Course online with a friend who hasn't played before
Perform 2 aerial gestures before touching the ground in co-op
Complete Chamber 3 in the Hard-Light Surfaces co-op course using only 5 total portal placements
Enter 4 different portals without touching the ground in co-op
Solve 3 co-op chambers in the Mass and Velocity course in under 60 seconds each
Complete Course 4 with neither you nor your co-op partner dying
Taunt GLaDOS in front of a camera in each of the five co-op courses
Win 3 co-op games of rock-paper-scissors in a row
While playing co-op, hug 3 different people on your friends list
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