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