You need to kill at least one bad guy with every weapon in the game. There are a total of 9 weapons in the game (well, 8 weapons, but one of them has two variations that you NEED to use). 1) Colt 45 - default weapon 2) FN Browning - This is Jack's pistol. You can use it at the gun fight at the Hall of Records, during the case "A Polite Invitation." 3) M1 Garand - During the case, "The Fallen Idol," you will get into a fight at the movie set. You can get this gun from the first guy you shoot as you're trying to get down from the top of the set. 4) Thompson (Stick) - Also found during "The Fallen Idol" case, at the final fight at the movie set. Once you come down the stairs, one of the two guys you come across has this gun. 5) Thompson (Drum) - Also found during "The Fallen Idol" case, at the final fight at the movie set. You will knock down a pillar after shooting some explosives, and you'll come across some guys before you go outside and backup arrives; the last guy you encounter has it. 6) Shotgun - When you start the "Armed and Dangerous" case, you are holding it. Kill one person with it and then drop the weapon... 7) Colt 38 - After you drop the shotgun in the "Armed and Dangerous" case, you will be holding this weapon. 8) BAR - You can find this weapon during the "A Different Kind of War" case. After you jump into the water in the sewers the first time and climbing up the ladder, there will be a guy beside a door on your right. Kill him and you'll find the BAR inside that room. 9) Flamethrower - You can find this weapon during the "A Different Kind of War" case. After picking up the BAR, you'll find another small room up a little farther, before you jump into the water again. You'll automatically pick it up if you go in the room before using the ladder to go into the water.