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