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