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