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