Tell me about it. I've been trying to get Bloody/Frostbitten for nine months now. My first two kills were Jorfus and Aotona. King Krush would have been my third. But one day I zoned into Sholazar from WG in the middle of Krush's southeastern patrol path. I could have north or south. I chose to check the northern half of that path first then double back to get the south. When I got back south, my macro picked him up already in combat. And there, right next to the Skyreach pillar, was Krush, just dying at the hands of some alliance dog. After that, I found almost all the rest pretty quickly, within maybe two months, leaving just three to find. Another two months and I found Hildana Deathstealer and Tukemuth within an hour of each other. That left just.... King Krush. In the subsequent five months I've been doing a flyover of his patrol paths once or twice every day and I still haven't found him again. In the process I've tamed Loque'nahak, and then killed him seven times. I don't even get excited anymore when he pops up on Silver Dragon.

For Bloody Rare I found Jurim easily. It's Okrek that I can't find in Terokar. Him, plus Fulgorge the worm in Hellfire, and Speaker Mar'grom in Blade's Edge that I haven't found yet. I don't spend alot of time in Outland though.

For all the trouble these acheivement are, I think there should be a reward for getting the both of them. I think a title is in order. Due to the amount of camping these potentially require, perhaps "Camper [name]". Or maybe "[name], the big game hunter". Or my personal favorite, "[name], Nesingwary's Pride". I'd wear that title constantly.