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