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