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