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