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