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