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