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