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