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