I am in chapter six and have only found 5 badges:

Mavalon
Krilag
Ilmadea
Brother P-----
Marketh
I cannot find the last one, please help if you know what I am talking about.

First off talk to the slave Soth in the basement of the museum and ask for a book to repair the bridge and then go to the bridge in the SW corner of the outdoor map, repair it, and cross with impudence... in the caves you'll find Joril and lots of other fun friends...

Yeah, I found out later on. I didn't ask the slave about a book, but I found the book lying on the floor and picked it up. I had seen that bridge in the lower left corner before, but i didn't know you could go on it. As a desperate attempt, I went over to the bridge, and it worked! I got Joril's badge by negotiating, I didn't actually have to kill any giants or anything. The only thing I had to kill was the giant guard, and the escape route for the slaves.
-Thanks anyway