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