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