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