Daily/Weelky/Monthly/Owervall Rewards

​As we can see on a lot of games, it could be quite interesting to get rewards, but also to get challenges.

Daily, Weekly, Monthly basis, but overall too. As there is in Gears of War and maybe other Games.

It would be balanced too, as it would be for PvE, and PvP too as well.

So, kill X kind of ennemies, or do X kills with a specific weapon, etc.

Feel free to comment if you agree, or for any suggestions on this matter! :)