Full list of all 14 InnerSpace achievements worth 1,000 gamerscore. It takes around 6-8 hours to unlock all of the achievements on Xbox One.
Encountered the Serpent.
While breaching the water in dive mode, pass over land before entering the water once more.
Pollinated the Accordion Blooms in the Sunchamber.
Collect 27 relics throughout the Inverse.
Encountered the Warden.
Unlock each world's signature airframe.
Encountered the Flock.
Visited your companions.
Encountered the Leviathan.
Flew into a world's sun.
Cut down a hanging garden or Windcatcher.
Encountered the Sunfish.
Unlocked your first plane.
Collected your first relic.