My attempt at getting the highest score

[Metathron]

Well, I kinda disagree. In my experience, the guardian angel one is rather tedious to get depending on the units you use of course; as for the fire mage medal, I usually raise a huge chunk of it just by casting spells "the natural way", i.e. not by artificially prolonging battles, since in my opinion spells like fire arrow and fireball are a mage's weapon of choice from the get go.