Here is the full list of all 17 Comit the Astrodian achievements.
Collect 100 Yellow Stars
Collect 1000 Yellow Stars
Cleared Starship Krater
Cleared Planet Cloud
Cleared Planet Frost
Cleared Planet Sandpit
Cleared Planet Sunburst
Cleared Planet Stormside
Cleared Planet Automata
Collect 50 Red Stars
Cleared Planet Wave
Cleared Planet Magmo
Collect 25 Red Stars
Destroy 100 Enemies
Collect 500 Yellow Stars
Cleared Planet Tropika
Collect 5 Red Stars