Dragon's Dogma: Dark Arisen

You definitely won't get this many kills during your first playthrough. If you started on Hard, you'll want to grind this out at the end of the game. If after completing all quests up to Fathom Deep, doing Bitterblack Isle, and grinding to Level 200 you still haven't hit it, you'll want to head to the Noble's Quarter. At this point of the game, you will be an enemy of the Duke and a non-stop stream of soldiers will be spawning from the church and the Duke's mansion. You can rack up a hundred kills every few minutes this way.