Frenzyheart Tribe

Hello guys,
first off, I apologise for any inconvenience if this post should not be in its proper place, but as it is a question related to how to quest I suppose it should be on this one. Anyways:

So yesterday I was levelling like any other casual day in Sholazar Basin, and it turns out I've done all quests I can receive, and when I mean all I mean all. Thing is I don't even have the achievement, so I started to research. It seems like I haven't done the Frenzyheart Tribe chain of quests, but there is no way, and I mean it, to get them. I have to point out, though, that I've done the one that's about killing monkeys, so I supposedly should be getting more quests from them, but I don't know, you guys tell me if there is something I'm missing out.

Thanks in advance.