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