Air Show
Perform 2 aerial gestures before touching the ground in co-op
20
Narbacular Drop
Place a portal under your co-op partner while they are gesturing
25
Iron Grip
Never lose a cube in Chamber 6 of the Mass and Velocity co-op course
20
$$$video
Triple Crown
Solve 3 co-op chambers in the Mass and Velocity course in under 60 seconds each
15
$$$video
Rock Portal Scissors
Win 3 co-op games of rock-paper-scissors in a row
20
$$$video
Empty Gesture
Drop your co-op partner in goo while they are gesturing by removing the bridge under them
25
$$$video
Portal Conservation Society
Complete Chamber 3 in the Hard-Light Surfaces co-op course using only 5 total portal placements
20
Can't Touch This
Dance in front of a turret blocked by a hard light bridge in co-op
10
$$$video
Party of Three
Find the hidden companion cube in co-op test chamber
25
$$$video
Still Alieve
Complete Course 4 with neither you nor your co-op partner dying
15
Gesticul-8
Perform all 8 gestures of your own volition in co-op
15
$$$video
Four Ring Circus
Enter 4 different portals without touching the ground in co-op
25
Asking for Trouble
Taunt GLaDOS in front of a camera in each of the five co-op courses
10
$$$video
Friends List With Benefits
While playing co-op, hug 3 different people on your friends list
50
Professor Portal
After completing co-op, complete Calibration Course online with a friend who hasn’t played before
75
