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