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