Here is the full list of all 31 Yoku's Island Express achievements. It takes around 10-12 hours to unlock all of the achievements on Windows.
Hatch the God Egg
Toot the noisemaker 1000 times
Complete the story
Collect all Wickerlings
Collect every ability upgrade
Unlock all treasure chests
Complete Willo's quest
Complete Rinri's quest
Complete Thorn quest
Become the Postmaster
Activate all Scarabs
Get the biggest wallet
Try every ball style
Defeat Screetch
Complete the temple trials
Deliver the cake to the inventors house
Unlock all the Beelines
Discover Fosfor’s Lair
Defeat the Spider
Befriend a Sootling
Customise Yoku’s ball
Ride the Beeline
Discover the heart cluster at the bottom of the sea
Save Spina
Collect the Divefish
Suck up a slug with the Slug Vacuum
Take the surviving egg to Dipperloaf
Toot the noisemaker 100 times
Find the Post-office
Free Kickback
Blow the noisemaker