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Step 1
Start out by playing the mission Vendetta in Call of Duty 5 for the Xbox 360. When you get to the part of the mission where you go upstairs to snipe all of the enemies on the ground, look to your right as soon as you get upstairs and you will find a pistol. You will need to use this pistol to unlock the Gunslinger Achievement in Call of Duty 5.
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Step 2
Go out to the balcony and start sniping out enemies. The sniper rifle is one of the most effective guns in Call of Duty 5 for the Xbox 360. You will eventually see General Amsel running around. Wait until General Amsel gets into his car because it is much easier to kill him because the car he is in moves slower than he does when he is running.
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Step 3
Start unloading pistol ammo into the car until you kill General Amsel. This is a difficult thing to do so it may take a few attempts. Once you kill General Amsel with the pistol, you will unlock the Gunslinger Achievement in Call of Duty 5 for the Xbox 360.
