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