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Being the achievement whore that I am, and knowing that others out there are as well, I thought it'd be good to have a centralized place where you can see what you have to do to get them all.

Single-Player Achievements

These achievements are unlocked in the single player campaign

Story-Progression Achievements

You will get these achievements just by playing all the way through the single player campaign. To avoid spoilers, these just have the achievement description next to them.

  • Wake Up Call - Survive the manual override

  • You Monster - Reunite with GLaDOS

  • Undiscouraged - Complete the first Thermal Discouragement Beam test

  • Bridge Over Troubling Water - Complete the first Hard Light Bridge test

  • SaBOTour - Make a break for it

  • Stalemate Associate - Press the button!

  • Tater Tote - Carry science forward

  • Vertically Unchallenged - Master the Repulsion Gel

  • Stranger Than Friction - Master the Propulsion Gel

  • White Out - Complete the first Conversion Gel test

  • Tunnel of Funnel - Master the Excursion Funnel

  • Dual Pit Experiment - Do the same test twice

  • The Part Where He Kills You - This is that part

  • Lunacy - That just happened

Optional Achievements

You actually have to earn these by doing specific tasks in the single player campaign. Many of these videos show how to beat certain chambers and should be considered spoilers

Co-Op Achievements

Completion Achievements

You will get these achievements simply by completing all of the co-op courses

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

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

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

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

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

  • High Five - Celebrate your cooperative calibration success - Simply do the high-five gesture after completing the co-op calibration course (comes automatically after finishing calibration course)

Optional Achievements

You actually have to earn these by doing specific tasks in co-op

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

  • Gesticul-8 - Perform all 8 gestures of your own volition in co-op - No explanation needed

  • Can't Touch This - Dance in front of a turret blocked by a hard light bridge in co-op - No explanation needed

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

  • Party of Three - Find the hidden companion cube in co-op test chamber - See it here

  • Narbacular Drop - Place a portal under your co-op partner while they are gesturing - No explanation needed

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

  • Air Show - Perform 2 aerial gestures before 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 - Here's how it's done

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

  • Triple Crown - Solve 3 co-op chambers in the Mass and Velocity course in under 60 seconds each - See how it's done

  • Still Alive - Complete Course 4 with neither you nor your co-op partner dying - No explanation needed

  • Asking for Trouble - Taunt GLaDOS in front of a camera in each of the five co-op courses - No explanation needed

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

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

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7  
Hi! Welcome to the site. This is a Q&A site, not a blogging platform. Incidentally, however, we do have a blog! This would make a perfect post. Want it published there instead? –  badp Apr 23 '11 at 17:29
2  
@fail badp, @Arda Xi I don't understand why this can't be a community Wiki answer, with a perfunctory question. –  Uticensis Apr 23 '11 at 17:35
1  
@DanielDiPaolo @Billare That's the point. It's an answer disguised as a question. However, I personally think it's a bit too broad for one question, maybe several just for the achievements that are not obvious. –  user56 Apr 23 '11 at 18:40
1  
@Bilare Because it's better suited as a tutorial/guide/blog post; I'd rather have a question per "interesting" achievement. –  badp Apr 23 '11 at 19:02
3  
This is surprising coming from a person with 10k rep on Stack Overflow. –  The Annoying Pyro Apr 23 '11 at 21:17
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closed as not a real question by Powerlord, Arda Xi, badp Apr 23 '11 at 17:27

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