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