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