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