Complete all test chambers in the Excursion Funnels co-op course
Complete all test chambers in all courses of co-op
Dance in front of a turret blocked by a hard light bridge in co-op
Perform 2 aerial gestures before touching the ground in co-op
Win 3 co-op games of rock-paper-scissors in a row
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
Complete all test chambers in the Hard-Light Surfaces co-op course
Perform all 8 gestures of your own volition in co-op
Refuse to solve the first test in Chapter 8
Place a cube on a button without touching the cube
Take GLaDOS' escape advice
Save a turret from redemption
Find a hidden portrait
Master the Excursion Funnel
This is that part
That just happened
Complete the first Conversion Gel test
Do the same test twice
Stand in a defective turret detector
Make a break for it
Press the button!
Carry science forward
Master the Repulsion Gel
Master the Propulsion Gel
Complete the first Hard Light Bridge test
Survive the manual override
Reunite with GLaDOS
Complete the first Thermal Discouragement Beam test
Complete Test Chamber 10 in 70 seconds
Show that pit who's boss
Break the rules in Test Chamber 07
Use an Aerial Faith Plate to launch a turret
Find the hidden signal in one of the Rat Man's dens
Catch a blue-painted box before it touches the ground
Discover the missing experiment
Examine all the vitrified test chamber doors
Break 11 test chamber monitors
Never lose a cube in Chamber 6 of the Mass and Velocity co-op course
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
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
While playing co-op, hug 3 different people on your friends list
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