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