There are 8 Bronze Trophies, 3 Silver Trophies, 1 Gold Trophy for this title.
Bronze:
Locked and Loaded
Objective: Begin the game with each weapon.
Colonel Red
Objective: Rescue Yellow by defeating Smash Daisaku.
OMG 11 Bosses
Objective: Complete the Dice Palace and defeat Black Beat Stepper.
Not Quite Red
Objective: Defeat Orange on the Flying Battleship.
Crab Attack
Objective: Defeat Crab Force in the Underground Mine.
Pink
Objective: Defeat Pinky Roader in the Ancient Ruins.
Bravoo Man
Objective: Defeat Bravoo Man in the Ancient Ruins.
Papaya Dance
Objective: Defeat Papaya Dance in the Ancient Ruins.
Silver:
Golden Silver
Objective: Defeat superboss Golden Silver.
O Brother
Objective: Defeat Green.
Greedy Fly
Objective: Defeat Black Fly.
Gold:
Complete The Game
Objective: Play through the final scene of Gunstar Heroes.