I think there might be a bug with Barbarian bob. I was going for the invincibob medal, and killed about 30 or so enemies without taking damage. I finally got hit with an arrow and I noticed it didn't register on the health meter. A little bit afterward, I know I should have taken a hit from one of the armored enemies but again no damage.
By now I'm in the castle right before the last boss and I still have full health meter. Even if I purposely let the enemies hit me I still had no damage taken off. I defeated the last boss and it awarded me the invincibob medal.
Strange. Anyone else experience something like this while playing Barbarian?