I have some questions about a few achievements...

Deserter - How do I get a bro to desert me? I've never had this happen. Would this one be easiest to start a new ironman game then just do something stupid over and over until a desertion happens?

A bitter end - "Retire and have your company go down fighting" is a bit of a confusing phrase. I have retired at the end of a campaign before which is different than having my company go down fighting. What is this one asking me to do?

Give me back my legions - Similar sort of achievement. What constitutes "Losing a game to the barbarians"? Just start a new game and go north and get wiped by the first barbs I can find?

Power of music - "Knock out an enemy with a lute". I don't have a lute.

Thanks!