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