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