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
Collect every ability upgrade
Activate all Scarabs
Hatch the God Egg
Collect all Wickerlings
Get the biggest wallet
Unlock all treasure chests
Become the Postmaster
Complete the story
Defeat Screetch
Complete Rinri's quest
Try every ball style
Complete Willo's quest
Complete Thorn quest
Customise Yoku’s ball
Unlock all the Beelines
Discover Fosfor’s Lair
Deliver the cake to the inventors house
Defeat the Spider
Befriend a Sootling
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
Take the surviving egg to Dipperloaf
Toot the noisemaker 100 times
Find the Post-office
Free Kickback
Blow the noisemaker