Getting into a vehicle will save you from suffering damage from a charging animal.
Break the Law
If you ever shoot a non-game animal and don't want to get busted, just return to your Trophy Room to wipe the slate clean.
Easy Money
In career mode buy a tag for wolf in Alberta, or coyote in Texas. The tag will only cost $200, but if you kill all 4 of them with one shot you get $100 for a clean shot bonus. After you kill all 4 of your animals go back to the main menu and into location, go to the store and you'll have $200 more than you started with at the beginning of your last hunt.
Extra Hunters
Beat an entire area in career mode then save and exit the game. Reload the game and start a new career to access the extra hunter. A hunter is unlocked for each area finished.
Get X Ray Scope
Get all tags in a level then play the area a second time using quick hunt mode. Press X while using the scope for X-ray vision.