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