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