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