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