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