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