Red Dead Redemption: Undead Nightmare Bigfoot location guide (Xbox 360, PS3)

Red Dead Redemption Undead Nightmare Big Foot Achievements guide to find Sasquatch - Six Years in the Making
Looking for the legendary Big Foot in Red Dead Redemption: Undead Nightmare?

Yup, the mystical creature Sasquatch of possibly fake, possibly real mythos can be found hidden within the newest downloadable content starring zombies!

Index of Undead Nightmare Guides

So how do you find this burly, hairy beast?

Follow this video to find him yourself, hunt it down and earn the “Six Years in the Making Achievement” worth 10 GamerPoints added to your GamerScore or a Bronze (I assume) Trophy for PS3.