Here is the full list of all 31 Wander trophies - there are 16 bronze, 9 silver, 5 gold and 1 platinum.
Spend half an hour in flight without landing
First time reaching the top of floating island
Discover a cave on a floating island
25 lorestones collected
Unlock all four forms
Unlock Griffin form
Unlock and successfully use ten communication glyphs
Fly to another island without landing or swimming
Unlock Azertash form
First time visiting the lore cave
First time swimming inside of Tower City
Enter unknown communication glyph 100 times
Unlock and successfully use five communication glyphs
Unlock Hira form
Unlock the fireflies
Collect every other trophy in Wander
Sky dive onto a Griffin from a floating island
Sky dive onto a Griffin from Tower City
Sky dive onto one Griffin from another
Execute all four Skydiving tricks in a single freefall
Complete all other Skydiving trophies
Gain more than 500m altitude via thermals
50 lorestones collected
75 lorestones collected
Explore ten different caves
Find Disophyros Chloroxylon in a place where it does not belong
Unlock and successfully use thirty communication glyphs
Spend an hour swimming
Gain passenger as Griffin
Find Griffin's nesting cave
Visit every area of the first island