Air Show - 20 gamerpoints - Perform 2 aerial gestures before touching the ground in co-op.
Asking for Trouble - 10 gamerpoints - Taunt GLaDOS in front of a camera in each of the five co-op courses.
Bridge Building - 15 gamerpoints - Complete all test chambers in the Hard-Light Surfaces co-op course.
Bridge Over Troubling Water - 10 gamerpoints - Complete the first Hard Light Bridge test.
Can't Touch This - 10 gamerpoints - Dance in front of a turret blocked by a hard light bridge in co-op.
Confidence Building - 10 gamerpoints - Complete all test chambers in the Mass and Velocity co-op course.
Door Prize - 20 gamerpoints - Examine all the vitrified test chamber doors.
Drop Box - 20 gamerpoints - Place a cube on a button without touching the cube.
Dual Pit Experiment - 15 gamerpoints - Do the same test twice.
Empty Gesture - 25 gamerpoints - Drop your co-op partner in goo while they are gesturing by removing the bridge under them.
Final Transmission - 20 gamerpoints - Find the hidden signal in one of the Rat Man's dens.
Four Ring Circus - 25 gamerpoints - Enter 4 different portals without touching the ground in co-op.
Friends List With Benefits - 50 gamerpoints - While playing co-op, hug 3 different people on your friends list.
Gesticul-8 - 15 gamerpoints - Perform all 8 gestures of your own volition in co-op.
Good Listener - 5 gamerpoints - Take GLaDOS' escape advice.
High Five - 5 gamerpoints - Celebrate your cooperative calibration success.
Iron Grip - 20 gamerpoints - Never lose a cube in Chamber 6 of the Mass and Velocity co-op course.
Lunacy - 20 gamerpoints - That just happened.
Narbacular Drop - 25 gamerpoints - Place a portal under your co-op partner while they are gesturing.
No Hard Feelings - 10 gamerpoints - Save a turret from redemption.
Obstacle Building - 15 gamerpoints - Complete all test chambers in the Excursion Funnels co-op course.
Overclocker - 30 gamerpoints - Complete Test Chamber 10 in 70 seconds.
Party of Three - 25 gamerpoints - Find the hidden companion cube in co-op test chamber.
Pit Boss - 30 gamerpoints - Show that pit who's boss.
Portal Conservation Society - 20 gamerpoints - Complete Chamber 3 in the Hard-Light Surfaces co-op course using only 5 total portal placements.
Portrait of a Lady - 10 gamerpoints - Find a hidden portrait.
Preservation of Mass - 20 gamerpoints - Break the rules in Test Chamber 07.
Professor Portal - 75 gamerpoints - After completing co-op, complete Calibration Course online with a friend who hasn’t played before.
Pturretdactyl - 5 gamerpoints - Use an Aerial Faith Plate to launch a turret.
Rock Portal Scissors - 20 gamerpoints - Win 3 co-op games of rock-paper-scissors in a row.
SaBOTour - 10 gamerpoints - Make a break for it.
Scanned Alone - 5 gamerpoints - Stand in a defective turret detector.
Schrodinger's Catch - 20 gamerpoints - Catch a blue-painted box before it touches the ground.
Ship Overboard - 10 gamerpoints - Discover the missing experiment.
Smash TV - 75 gamerpoints - Break 11 test chamber monitors.
Stalemate Associate - 15 gamerpoints - Press the button!.
Still Alive - 15 gamerpoints - Complete Course 4 with neither you nor your co-op partner dying.
Stranger Than Friction - 15 gamerpoints - Master the Propulsion Gel.
Tater Tote - 15 gamerpoints - Carry science forward.
Team Building - 10 gamerpoints - Complete all test chambers in the Team Building co-op course.
The Part Where He Kills You - 20 gamerpoints - This is that part.
Triple Crown - 15 gamerpoints - Solve 3 co-op chambers in the Mass and Velocity course in under 60 seconds each.
Tunnel of Funnel - 15 gamerpoints - Master the Excursion Funnel.
Undiscouraged - 10 gamerpoints - Complete the first Thermal Discouragement Beam test.
Vertically Unchallenged - 15 gamerpoints - Master the Repulsion Gel.
Wake Up Call - 5 gamerpoints - Survive the manual override.
White Out - 15 gamerpoints - Complete the first Conversion Gel test.
You Made Your Point - 10 gamerpoints - Refuse to solve the first test in Chapter 8.
You Monster - 5 gamerpoints - Reunite with GLaDOS.
You Saved Science - 100 gamerpoints - Complete all test chambers in all courses of co-op.
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