Here is the full list of all 12 RocketGO achievements.
Have all updates
Found all Alien Gears
Finish all stages in the game
Finish all stages in Planet Hollow
Finish all stages in Planet Inferno
Finish all stages in Planet Storm
Have one update
Finish all stages in Planet Acid
Found one Alien Gear
Finish all stages in Planet Wave
Finish all stages in Planet Ruby
Finish one stage