Full list of all 12 Gunstar Heroes achievements worth 200 gamerscore. It takes around 2-3 hours to unlock all of the achievements on Xbox 360.
Achievements they've won
Achievements they've not won
Defeat Crab Force in the Underground Mine.
Defeat Black Fly.
Rescue Yellow by defeating Smash Daisaku.
Begin the game with each weapon.
Play through the final scene of Gunstar Heroes.
Defeat superboss Golden Silver.
Complete the Dice Palace and defeat Black Beat Stepper.
Defeat Orange on the Flying Battleship.
Defeat Pinky Roader in the Ancient Ruins.
Defeat Bravoo Man in the Ancient Ruins.
Defeat Papaya Dance in the Ancient Ruins.