Challengers system ideas

Hello everyone, I am developing a series of plugins for Hurworld, one of them is a system with the statistics of the players in the form of API, supporting the various plugins already developed, so that you can consult any statistics of A player in specific, kills, deaths, k / d ratio, suicides, money, duels, if he owns a vehicle, if he has been killed by some animal, among other things. With the help of this plugin I am developing two more, some is a TOP of players, one with general punctuation, another of kills, another of deaths, etc .; And the other is a system of challenges, which consists of going over several challenges to go up the level, and when you overcome a level you are awarded a reward.
I've come a long way, progress can be seen in Github.
I open this thread to see ideas about everything that can be taken as a challenge in the game.
As soon as this finished a decent version of the plugins I upload them here.
Greetings and I await your comments


Challenges for now:
* Belong to a clan
* Belong to at least one stake
* Play for X hours
* Suicide X times
* Die X times
* Kill X times
* Win X duels
* Have $X
* Die by a animal(bor, tokar, yeti, etc)
* Die by starve, cold, radiation, poison, explosion, etc
* Have a kanga, a roach, a goat