Portal 2

Pturretdactyl

Use an Aerial Faith Plate to launch a turret

Final Transmission

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

Good Listener

Take GLaDOS' escape advice

Scanned Alone

Stand in a defective turret detector

No Hard Feelings

Save a turret from redemption

Schrodinger's Catch

Catch a blue-painted box before it touches the ground

Ship Overboard

Discover the missing experiment

Door Prize

Examine all the vitrified test chamber doors

Portrait of a Lady

Find a hidden portrait

You Made Your Point

Refuse to solve the first test in Chapter 8

Smash TV

Break 11 test chamber monitors

High Five

Celebrate your cooperative calibration success

Team Building

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

Confidence Building

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

Bridge Building

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

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

Can't Touch This

Dance in front of a turret blocked by a hard light bridge 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

Air Show

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

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

Rock Portal Scissors

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

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