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Portal 2
Platform: Steam
Genre: Action/Adventure
Release date: April 18th, 2011
Developer: Valve
Publisher: Valve

List of achievements:

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

You Saved Science
Complete all test chambers in all courses of co-op

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

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

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

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

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

High Five
Celebrate your cooperative calibration success

High Five
Celebrate your cooperative calibration success

You Made Your Point
Refuse to solve the first test in Chapter 8

Portrait of a Lady
Find a hidden portrait

Door Prize
Examine all the vitrified test chamber doors

Door Prize
Examine all the vitrified test chamber doors

Ship Overboard
Discover the missing experiment

Ship Overboard
Discover the missing experiment

Schrodinger's Catch
Catch a blue-painted box before it touches the ground

No Hard Feelings
Save a turret from redemption

No Hard Feelings
Save a turret from redemption

Scanned Alone
Stand in a defective turret detector

Scanned Alone
Stand in a defective turret detector

Good Listener
Take GLaDOS' escape advice

Good Listener
Take GLaDOS' escape advice

Preservation of Mass
Break the rules in Test Chamber 07

Preservation of Mass
Break the rules in Test Chamber 07

Preservation of Mass
Break the rules in Test Chamber 07

Pit Boss
Show that pit who's boss

Drop Box
Place a cube on a button without touching the cube

Lunacy
That just happened

Lunacy
That just happened

Lunacy
That just happened

The Part Where He Kills You
This is that part

The Part Where He Kills You
This is that part

The Part Where He Kills You
This is that part

Dual Pit Experiment
Do the same test twice

Dual Pit Experiment
Do the same test twice

Dual Pit Experiment
Do the same test twice

Tunnel of Funnel
Master the Excursion Funnel

Tunnel of Funnel
Master the Excursion Funnel

Tunnel of Funnel
Master the Excursion Funnel

White Out
Complete the first Conversion Gel test

White Out
Complete the first Conversion Gel test

White Out
Complete the first Conversion Gel test

Stranger Than Friction
Master the Propulsion Gel

Stranger Than Friction
Master the Propulsion Gel

Stranger Than Friction
Master the Propulsion Gel

Vertically Unchallenged
Master the Repulsion Gel

Vertically Unchallenged
Master the Repulsion Gel

Vertically Unchallenged
Master the Repulsion Gel

Tater Tote
Carry science forward

Tater Tote
Carry science forward

Tater Tote
Carry science forward

Stalemate Associate
Press the button!

Stalemate Associate
Press the button!

Stalemate Associate
Press the button!

SaBOTour
Make a break for it

SaBOTour
Make a break for it

SaBOTour
Make a break for it

Bridge Over Troubling Water
Complete the first Hard Light Bridge test

Bridge Over Troubling Water
Complete the first Hard Light Bridge test

Bridge Over Troubling Water
Complete the first Hard Light Bridge test

Undiscouraged
Complete the first Thermal Discouragement Beam test

Undiscouraged
Complete the first Thermal Discouragement Beam test

Undiscouraged
Complete the first Thermal Discouragement Beam test

Undiscouraged
Complete the first Thermal Discouragement Beam test

You Monster
Reunite with GLaDOS

You Monster
Reunite with GLaDOS

You Monster
Reunite with GLaDOS

You Monster
Reunite with GLaDOS

Wake Up Call
Survive the manual override

Wake Up Call
Survive the manual override

Wake Up Call
Survive the manual override

Wake Up Call
Survive the manual override

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

Friends List With Benefits
While playing co-op, hug 3 different people on your friends list

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

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

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

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

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

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

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

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

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

Party of Three
Find the hidden companion cube in co-op test chamber

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

Can't Touch This
Dance in front of a turret blocked by a hard light bridge in co-op

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

Smash TV
Break 11 test chamber monitors

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

Pturretdactyl
Use an Aerial Faith Plate to launch a turret

Overclocker
Complete Test Chamber 10 in 70 seconds