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