Portal 2

Still Alive

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

Talent Show

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

Portal Conservation Society

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

Triple Crown

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

Party of Three

Find the hidden companion cube in co-op test chamber

Iron Grip

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

Smash TV

Break 11 test chamber monitors

Overclocker

Complete Test Chamber 10 in 70 seconds

Friends List With Benefits

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

Empty Gesture

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

Final Transmission

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

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

You Made Your Point

Refuse to solve the first test in Chapter 8

Four Ring Circus

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

Schrodinger's Catch

Catch a blue-painted box before it touches the ground

Door Prize

Examine all the vitrified test chamber doors

Pit Boss

Show that pit who's boss

Pturretdactyl

Use an Aerial Faith Plate to launch a turret

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

Can't Touch This

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

Ship Overboard

Discover the missing experiment

Portrait of a Lady

Find a hidden portrait

You Saved Science

Complete all test chambers in all courses of co-op

Preservation of Mass

Break the rules in Test Chamber 07

Obstacle Building

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

Gesticul-8

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

Good Listener

Take GLaDOS' escape advice

Drop Box

Place a cube on a button without touching the cube

No Hard Feelings

Save a turret from redemption

Bridge Building

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

Air Show

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

Lunacy

That just happened

The Part Where He Kills You

This is that part

Scanned Alone

Stand in a defective turret detector

Tunnel of Funnel

Master the Excursion Funnel

Dual Pit Experiment

Do the same test twice

White Out

Complete the first Conversion Gel test

Stranger Than Friction

Master the Propulsion Gel

Confidence Building

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

Tater Tote

Carry science forward

Vertically Unchallenged

Master the Repulsion Gel

Stalemate Associate

Press the button!

SaBOTour

Make a break for it

Team Building

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

Bridge Over Troubling Water

Complete the first Hard Light Bridge test

High Five

Celebrate your cooperative calibration success

Undiscouraged

Complete the first Thermal Discouragement Beam test

You Monster

Reunite with GLaDOS

Wake Up Call

Survive the manual override