axelle was first to do this, and me second I believe. I used humans for the first 4 fights and then just Emerald Dragons for the last two. Screenshots in other thread:
http://forum.1cpublishing.eu/showthr...t=16416&page=3
EDIT: there's no way to get a real high score in DotC - it's simply too small. It would be nice to have separate high score screens for each campaign, but I don't really care too much about scores either. No-loss though - that's a challenge.