Pick up the M6D Pistol

Find the Sniper Rifle

Find the Speed Boots to move faster

Pick up the 1st key and enter the base

Pick up the 2nd key and go outside

Pick up the 3rd key and enter the final area

Defeat the final boss and beat the game

Defeat the final boss and beat the game in Legendary Mode

Beat the game without losing a life or picking up a shield