Here's another Red Dead Redemption achievement tutorial for all you hunters out there. In this video, you'll have to be able to have access to the North in RDR. Once you do, find the buffalo and shoot as many as you can but let them run off. Then setup camp or fast travel to another place and comeback. Keep doing this until you've killed the last buffalo. Once that is done, the Manifest Destiny achievement is yours. So good luck and enjoy RDR!