You're Fired!G 25

You're Fired! G25:
Kill 10 Quest Bosses

Bosses are enemies that you encounter when out on quests who are a bit tougher than their regular versions. They’re easily identified by a red skull that will appear next to their health bar in battle and have a bit more health and do more damage than the normal version. Just kill 10 of these baddies and this achievement is yours.