Here is the full list of all 13 Gravity Ghost trophies - there are 9 bronze, 3 silver and 1 gold.
Beat the game
Terraform 100 planets
Collect all 7 geoms
Carry all 7 planet pieces at once
Reunite all 14 animals
Terraform the biggest planet in the game
Float for 10 minutes without touching the ground
Reach max hair length
Collect all 107 stars
Carry all 14 animal spirits at once
Carry all animal spirits and planet pieces at once
Speedrun the game in less than 50 minutes
Reunite all animals, collect all geoms, collect all stars