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