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