Portal 2

Obstacle Building

Complete all test chambers in the Excursion Funnels co-op course

You Saved Science

Complete all test chambers in all courses of co-op

Iron Grip

Never lose a cube in Chamber 6 of the Mass and Velocity co-op course

Gesticul-8

Perform all 8 gestures of your own volition in co-op

Empty Gesture

Drop your co-op partner in goo while they are gesturing by removing the bridge under them

Party of Three

Find the hidden companion cube in co-op test chamber

Narbacular Drop

Place a portal under your co-op partner while they are gesturing

Professor Portal

After completing co-op, complete Calibration Course online with a friend who hasn’t played before

Portal Conservation Society

Complete Chamber 3 in the Hard-Light Surfaces co-op course using only 5 total portal placements

Four Ring Circus

Enter 4 different portals without touching the ground in co-op

Triple Crown

Solve 3 co-op chambers in the Mass and Velocity course in under 60 seconds each

Still Alive

Complete Course 4 with neither you nor your co-op partner dying

Asking for Trouble

Taunt GLaDOS in front of a camera in each of the five co-op courses

Friends List With Benefits

While playing co-op, hug 3 different people on your friends list

Talent Show

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

Bridge Building

Complete all test chambers in the Hard-Light Surfaces co-op course

Can't Touch This

Dance in front of a turret blocked by a hard light bridge in co-op

Confidence Building

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

Rock Portal Scissors

Win 3 co-op games of rock-paper-scissors in a row

Team Building

Complete all test chambers in the Team Building co-op course

Pit Boss

Show that pit who's boss

Smash TV

Break 11 test chamber monitors

Portrait of a Lady

Find a hidden portrait

Door Prize

Examine all the vitrified test chamber doors

Schrodinger's Catch

Catch a blue-painted box before it touches the ground

Overclocker

Complete Test Chamber 10 in 70 seconds

Preservation of Mass

Break the rules in Test Chamber 07

Final Transmission

Find the hidden signal in one of the Rat Man's dens

Drop Box

Place a cube on a button without touching the cube

Pturretdactyl

Use an Aerial Faith Plate to launch a turret

You Made Your Point

Refuse to solve the first test in Chapter 8

Air Show

Perform 2 aerial gestures before touching the ground in co-op

High Five

Celebrate your cooperative calibration success

Ship Overboard

Discover the missing experiment

Scanned Alone

Stand in a defective turret detector

No Hard Feelings

Save a turret from redemption

Good Listener

Take GLaDOS' escape advice