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