Just wanted to point out - for the Huntsman challenge - hunt the special Bobcat. People have recommended staying on top of the rock and waiting for him to eventually come towards you.
Best way I have found... Immediately after you find the 2nd clue, he will appear and run through the small canyon, have gun ready and shoot immediately. As simple as that.
Working On: AC: Unity, AC: Rogue, NHL '15 (XB1), Cabela's BGH: Pro Hunts, Ryse, Worms Battleground
100% game totals (all DLC included): 77
Cabela's North American Hunts: Achievement Guide by Goots 88