Call of Juarez: The Cartel
51 Achievements
17-21h
Raining Bullets
Shoot over 1000 bullets during the Ghost Town level.
4.1%
How to unlock the Raining Bullets achievement in Call of Juarez: The Cartel - Definitive Guide
You could try get this legitimately throughout the level, although it would be quite difficult due to ammo complications. At the start when you are testing the weapons, you have infinite ammo, so it makes it quite easy to simply burn this achievement out at the very beginning.
Update: Thanks Mobius Evalon for pointing out that "Ghost Town" is Chapter 9.
This can be unlocked in Chapter 9. Right after you get the Wild West trophy you will have to do some target practice with 3 different weapons. I recommend start wasting bullets once you get the second weapon and have to shoot at the roofs of the houses with the LMG (light machine gun, 100 bullet clip). When you reach 200 bullets you will get a blue icon on the bottom right corner of the screen showing “Raining Bullets x/1000”, which will tell you of your progress. The icon will appear every 200 bullets after that (400/1000; 600/1000, 800/1000, and finally trophy). Just keep on shooting till the trophy pops up. If you run out of bullets just look inside the room you are in the ammo is on top of some crates. Just make sure NOT to complete the third (rocket launcher) task before you get the trophy.
The “Ghost Town” level is Chapter 9 starts off in a small shack if your playing as Ben or Eddie, where an arms dealer will have you testing out different weapons. Simply pick up a weapon and start unloading bullets. There is infinite ammo pickups located in this area. The game tracks every 200 bullets fired. If playing as Kim you start off on a rooftop, and the only weapon available is a sniper rifle, that only holds 5 bullets...So Don't do this with Kim...
...and here a the vid!!!
Playing as Eddie, you can also take weapons (machine gun and machine gun) and fire 1000 shots.