Complete all test chambers in the Mass and Velocity co-op course

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

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

Never lose a cube in Chamber 6 of the Mobility Gels co-op course