Here is the full list of all 32 Yoku's Island Express trophies - there are 15 bronze, 11 silver, 5 gold and 1 platinum.
Get every trophy
Activate all Scarabs
Complete Thorn quest
Hatch the God Egg
Collect all Wickerlings
Unlock all treasure chests
Get the biggest wallet
Toot the party horn 1000 times
Collect every ability upgrade
Complete Rinri's quest
Become the Post Master
Discover Fosfor’s Lair
Complete the story
Defeat the Spider
Complete Willo's quest
Try every ball style
Customise Yoku’s Ball
Unlock all the Beelines
Befriend a Sootling
Save Spina
Deliver the cake to the inventors house
Defeat Screetch
Complete the temple trials
Discover the heart cluster at the bottom of the sea
Ride the Beeline
Collect the Divefish
Suck up a slug with the Slug Vacuum
Take the surviving egg to Dipperloaf
Toot the party horn 100 times
Find the Post-office
Free Kickback
Blow the party horn