Since Agatio hasn't given us an option to see our personal stats on kills/deaths, or just kills atleast, for any char we'd like to check.
And seeing there's a red quest with an counter, that requires two given classes to be killed. Therefore, I am assuming that a quest could be made which would tell you the amount of any 150 class you've killed. I.e,
Archer: 29
Assassin: 44
Cleric: 28
etc.
Now this quest could be auto which you get at the beginning of each month, or take it from an NPC, but ends with the month. And it should be trashable, and able to be retaken at any given tame. (Counter resets of course)
+, - or edit the suggestion your own way, anything but flaming is appreciated.