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