Here is the full list of all 12 Starshifter achievements.
Fly continuously for over a minute
100% the game and earned a reward!
Complete all prairie quests
Complete all forest quests
Complete all marsh quests
Complete all mountain quests
Collect all coyote skins
Collect all crow skins
Collect all weasel skins
Save all the bosses
...
Found your place as a Guardian