Been killing elite jarl over and over for almost two hours now, and i get no notifications after killing elite mobs/bosses so i have absolutely no idea of my boss kills left towards the achievement. To me it does seem that Jarl is considered an elite boss towards the achievent: He drops Elite chests and spawns after a certain number of mobs are killed.

But seriously, anyone know if he does count as a boss kill? Don't want to waste any more of my time farming Elite Brackenridge.