Here is the full list of all 27 Harold Halibut achievements.
Complete the game.
Complete Chapter 6.
Complete Chapter 5.
Untangle the story of the brothers.
Complete Chapter 4.
Read and deliver all of Buddy's letters.
Help Slippie set up in the Energy Disctrict.
Convince Warren to move Water Wieners to the Cave.
Talk with everyone about the exchange.
Complete Chapter 3.
Complete Chapter 2.
Support Captain-at-large Zoya during all walks of life.
Watch Onat's stage performance.
Clean all of the graffiti.
Listen to the Announcer under the shower.
Play Rapid Fly Zone Force for 2 Minutes.
Complete Chapter 1.
Try to pick up the sample directly from Brigitte.
Watch TV for 10 minutes.
Update Mareaux about every step of the search for the Blue Rock.
Try out Slippie's ski slope.
Participate in the station jog.
Make your first trip on the All Water tube.
Complete the Notebook.
Enjoy the game at a leasurely pace (more than 15 hours play time.)
Attempt to leave the All Water Office 3 times.
Listen to all of the gossip at Gertrude's Bierzone.