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