I made this guide with a lot of love for this game, I still remember how I played the trial version on an old hp laptop. and more than 13 years later I decided to get all the achievements.

You always return to the place where you were happy.

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Subversive Traveler
There is a secret

• In Chapter 2, "Beauty and the Electric Tentacle", pan to the left and you'll see a pink head. The goal is to make the pink head fall off the left side of the power lines. To do this you must use all the pink balloons and place them on the right hand side to make her roll off, Once successful, she'll fall and break into a million pieces and if you had followed her descent, you'll see a sign that reads, "It's so Simple" "From the Original Sign Painter". When you read the sign the achievement unlocks.

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Vice President of Goo Product
All Levels Complete

• Unlocked after completing Chapter 5 - Observatory Observation Station. All you have to do is raise the telescope by attaching all the pink spiky flying Goos.

Originally posted by Fandom.com:

OCD or Obsessive Completion Distinction are optional achievements available in World of Goo. OCD is not relevant to completing the game (unless trying to complete everything in the game). Getting OCD requires one of three things:

1. Getting a large amount of Goo Balls (usually more than double the normal requirement)
2. Completing the level within a certain time limit
   
3. completing the level with a minimal amount of moves.

The OCD requirement for a level can be checked by opening the menu and then selecting the OCD option.

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Engineer of Goo I
All OCD Flags in Chapter 1

• Going Up - Collect 11 or more Goo Balls
  
• Small Divide - Collect 16 or more Goo Balls
  
• Hang Low - Collect 22 or more Goo Balls
  
• Impale Sticky - Collect 42 or more Goo Balls
  
• Flying Machine - Complete in 16 seconds or less
  
• Ivy Towers - Collect 16 or more Goo Balls
  
• Tumbler - Collect 35 or more Goo Balls
  
• Chain - Collect 25 or more Goo Balls
  
• Fisty's Bog - Complete in 14 moves or less
  
• Tower of Goo - Collect 68 or more Goo Balls
  
• Ode to the Bridge Builder - Collect 38 or more Goo Balls
  
• Regurgitation Pumping Station - Complete in 42 or less moves⠀⠀⠀⠀⠀⠀⠀  ⠀⠀⠀⠀

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Engineer of Goo II
All OCD Flags in Chapter 2

• Drool - Collect 24 or more Goo Balls
  
• Fly Away Little Ones - Collect 12 or more Goo Balls
  
• Blustery Day - Collect 18 or more Goo Balls
  
• Welcoming Unit - Collect 61 or more Goo Balls
  
• Beauty School - Complete in 21 seconds or less
  
• Leap Hole - Complete in 13 seconds or less
  
• Volcanic Percolator Day Spa - Complete in 30 moves or less
  
• Beauty and the Electric Tentacle - Collect 29 or more Goo Balls ⠀⠀⠀⠀⠀⠀⠀ ⠀⠀⠀⠀
  
• Whistler - Complete in 29 seconds or less
  
• The Red Carpet - Complete in 45 moves or less
  
• Genetic Sorting Machine - Complete in 24 moves or less

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Engineer of Goo III
All OCD Flags in Chapter 3

• Burning Man - Complete in 11 moves or less
  
• Second Hand Smoke - Collect 25 or more Goo Balls
  
• Super Fuse Challenge Time - Collect 32 or more Goo Balls
  
• Misty's Long Bony Road - Collect 26 or more Goo Balls
  
• The Third Wheel - Complete in 9 moves or less
  
• Water Lock - Collect 44 or more Goo Balls
  
• Upper Shaft - Collect 45 or more Goo Balls
  
• You Have To Explode The Head - Collect 49 or more Goo Balls⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀  
  
• Incineration Destination - Complete in 34 moves or less
  
• Product Launcher - Complete in 12 moves or less

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Engineer of Goo IV
All OCD Flags in Chapter 4

• Hello, World - Complete in 9 seconds or less
  
• Bulletin Board System - Collect 13 or more Goo Balls
  
• Grape Vine Virus - Collect 13 or more Goo Balls
  
• Graphic Processing Unit - Collect 12 or more Goo Balls
  
• Road Blocks - Complete 22 moves or less
  
• Graceful Failure - Complete in 36 seconds or less
  
• Alice and Bob and the Third Party - Collect 42 or more Goo Balls⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀ 
  
• The Server Farm - Collect 24 or more Goo Balls
  
• MOM's Computer - Complete in 15 moves or less
  
• Deliverance - Complete in 7 moves or less

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Engineer of Goo V
All OCD Flags in Chapter 5

• Infesty The Worm - Collect 16 or more Goo Balls
  
• Horizontal Transportation Innovation Committee - Collect 40 or more Goo Balls
  
• Weather Vane - Collect 42 or more Goo Balls
  
• Observatory Observation Station - No OCD Challenge

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The Architect of Goo
All OCD Flags

• Unlocked after completing all of the OCD challenges, see the above achievements for solutions to get the OCD Flags.

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