This is a mission in Mission Mode.
To get Mission mode you have to beat Story mode, which unlocks Mission mode. The mission you want will not be available yet. You have to beat these missions, which unlock the next few missions. Beat these missions and they unlock the next and so on. Keep beating missions and eventullay you'll get a mission called "Planet Draco's Masters". Beating this mission will unlock the achievement at the end of the mission on the grade screen.