Here is the full list of all 15 InnerSpace trophies - there are 2 bronze, 2 silver, 10 gold and 1 platinum.
Collect all trophies.
Collect 27 relics throughout the Inverse.
Unlock each world's signature airframe.
Encounter the Serpent.
Pollinate the Accordion Blooms in the Sunchamber.
Encounter the Warden.
Encounter the Flock.
Encounter the Leviathan.
Visit your companions.
Fly into a world's sun.
Cut down a hanging garden or Windcatcher.
Encounter the Sunfish.
While breaching the water from dive mode, pass over land before entering the water once more.
Unlock your first airframe.
Collect your first relic.