Not elite but just normal jarl

[Gameplay]

No matter how I kill jarl it won't give me the achievement for killing him

[Peekaboo]

No matter how I kill jarl it won't give me the achievement for killing him

After you killed him, he will drop a bag, press the bag.

[Gameplay]

I did that and still nothing I think it's bugged

[Peekaboo]

I did that and still nothing I think it's bugged

Than I'm not sure never encounter this before

Edit: I just saw a thread with the same problem with you, his problem is that he did not complete the previous quest. Maybe you can try checking your quest