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