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