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