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