Call of Juarez: The Cartel

Bit of a long one as it involves playing through the game 3 times so there's no shortcut I'm afraid, the only thing you can do is one of your playthroughs on hard to get that achievement (best done in coop) and then try the other 2 on easy and try and run through quick,
The game tracks your progress and you can check that when you pick your character, there will be a tick next to the level completed.

If you've not heard there is a glitch thats easy to do that makes you invincible (single player only) but you need to do it on each level. All you need to do is activate you concentration then hit start and reload your check point ( you can die from falling off the side of levels, by helicopters and in the car)
Anyway hoe this helps should take you between 10-15 hours.