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