Dungeons & Dragons: Chronicles of Mystara

After completing both games once I had around 600 kills. So you'll need two playthroughs of each game.

You'll need to replay with different characters in order to complete all of the challenges anyway
so this will come naturally as you work on Completionist.


edit:
I don't know how anyone could possibly downvote this, but I'd love to hear the reason. It's a killcount achievement for crying out loud. If you're going to get the Completionist you can't possibly not get this, so what else is there to say? There's no strategy. Just keep playing. #facepalm