Als onderdeel van The Orange Box maakte Portal veel indruk, de titel deed het zelfs zo goed dat besloten werd een tweede deel als op zichzelf staande titel uit te brengen.
De game komt op zowel de PC, PlayStation 3 als Xbox 360 uit en krijgt hierbij en volledige lijst met achievements, te weten het maximale aantal van vijftig stuks. Om deze te verdienen zul je het onderstaande moeten doen, waarbij er dit keer eens geen geheimen voor ons zijn.
Pit Boss 30
Show that pit who's boss
Preservation of Mass 20
Break the rules in Test Chamber 07
Pturretdactyl 5
Use an Aerial Faith Plate to launch a turret
Lunacy 20
That just happened
Drop Box 20
Place a cube on a button without touching the cube
Overclocker 30
Complete Test Chamber 10 in 70 seconds
No Hard Feelings 10
Save a turret from redemption
Schrodinger's Catch 20
Catch a blue-painted box before it touches the ground
Ship Overboard 10
Discover the missing experiment
Final Transmission 20
Find the hidden signal in one of the Rat Man's dens
Good Listener 5
Take GLaDOS' escape advice
Scanned Alone 5
Stand in a defective turret detector
The Part Where He Kills You 20
This is that part
Bridge Over Troubling Water 10
Complete the first Hard Light Bridge test
SaBOTour 10
Make a break for it
Stalemate Associate 15
Press the button!
Wake Up Call 5
Survive the manual override
You Monster 5
Reunite with GLaDOS
Undiscouraged 10
Complete the first Thermal Discouragement Beam test
White Out 15
Complete the first Conversion Gel test
Tunnel of Funnel 15
Master the Excursion Funnel
Dual Pit Experiment 15
Do the same test twice
Tater Tote 15
Carry science forward
Vertically Unchallenged 15
Master the Repulsion Gel
Stranger Than Friction 15
Master the Propulsion Gel
Professor Portal 75
After completing co-op, complete Calibration Course online with a friend who hasn’t played before
Air Show 20
Perform 2 aerial gestures before touching the ground in co-op
Portal Conservation Society 20
Complete Chamber 3 in the Hard-Light Surfaces co-op course using only 5 total portal placements
Empty Gesture 25
Drop your co-op partner in goo while they are gesturing by removing the bridge under them
Party of Three 25
Find the hidden companion cube in co-op test chamber
Narbacular Drop 25
Place a portal under your co-op partner while they are gesturing
Asking for Trouble 10
Taunt GLaDOS in front of a camera in each of the five co-op courses
Rock Portal Scissors 20
Win 3 co-op games of rock-paper-scissors in a row
Friends List With Benefits 50
While playing co-op, hug 3 different people on your friends list
Four Ring Circus 25
Enter 4 different portals without touching the ground in co-op
Triple Crown 15
Solve 3 co-op chambers in the Mass and Velocity course in under 60 seconds each
Still Alive 15
Complete Course 4 with neither you nor your co-op partner dying
Can't Touch This 10
Dance in front of a turret blocked by a hard light bridge in co-op
Smash TV 75
Break 11 test chamber monitors
High Five 5
Celebrate your cooperative calibration success
Team Building 10
Complete all test chambers in the Team Building co-op course
Door Prize 20
Examine all the vitrified test chamber doors
Portrait of a Lady 10
Find a hidden portrait
You Made Your Point 10
Refuse to solve the first test in Chapter 8
You Saved Science 100
Complete all test chambers in all courses of co-op
Iron Grip 20
Never lose a cube in Chamber 6 of the Mass and Velocity co-op course
Gesticul-8 15
Perform all 8 gestures of your own volition in co-op
Confidence Building 10
Complete all test chambers in the Mass and Velocity co-op course
Bridge Building 15
Complete all test chambers in the Hard-Light Surfaces co-op course
Obstacle Building 15
Complete all test chambers in the Excursion Funnels co-op course
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