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