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