Here is the full list of all 15 Jettomero: Hero of the Universe achievements.
Fly through all the rings
Collect all parts
Prove you're the best of the best
Extinguish a forest fire
Destroy 25 asteroids
Find a way to actually save the humans
Make a difficult decision
Unlock all back issues
Search for survivors in a pile of rubble
Catch a comet
Land on a moon
Chase a storm away
Find a helpful lift
Get real warm
Find a purpose