vidsloth

Place a cube on a button without touching the cube

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

Celebrate your cooperative calibration success

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Master the Excursion Funnel

Do the same test twice

Complete the first Conversion Gel test

Master the Propulsion Gel

Carry science forward

Discover the missing experiment

Master the Repulsion Gel

Press the button!

Stand in a defective turret detector

Make a break for it

Complete the first Hard Light Bridge test

Complete the first Thermal Discouragement Beam test

Reunite with GLaDOS

Survive the manual override

Complete Test Chamber 10 in 70 seconds

Show that pit who's boss

Break the rules in Test Chamber 07

Use an Aerial Faith Plate to launch a turret

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

Take GLaDOS' escape advice

Save a turret from redemption

Catch a blue-painted box before it touches the ground

Examine all the vitrified test chamber doors

Find a hidden portrait

Refuse to solve the first test in Chapter 8

Break 11 test chamber monitors

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

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

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

Complete all test chambers in all courses of co-op

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

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

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

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

Find the hidden companion cube in co-op test chamber

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

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

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

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

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

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

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

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

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

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

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