Star Wars: The Force Unleashed

The easiest place to get this on the Darth Vader level at the start of the game. Towards the end of the level, a Tie Fighter will crash into a bridge, forcing you to take an alternate route.

Once you cross the first bridge into a covering, there will be another bridge taking you to where you would of gone had the first bridge not been destroyed.

Here there will be unlimited enemies, so simply continue killing them using force repulse until you get the achievement

This one is also fairly quick and easy to do on the Jedi Temple DLC. Just start it up on apprentice and after watching the opening video, you'll jump out of your ship.

Do it here on this group of stormtroopers, keep hitting them with your force repulse and wipe out all of them in this first area. Don't open the gate to the temple,just save and then exit to the main menu, select continue game and keep repeating these steps until it pops.

In all likelihood, you got this game to play through it, and if you're like me, you glanced at the achievement list, saw lots of "kill tons of enemies," and you thought to yourself: "No problem, I'm playing through the entire game. I'll pick it up as I go along."

Now, you're sitting there, like me, wondering where to go with this after completing that story mode since you cannot replay the prologue AND your kills won't carry over to your Sith Master save, nor can you carry them over to that Jedi Temple DLC. That means all of the wonderful solutions you've been reading won't work at all if you want to keep all of your progress. Are the Jedi Temple and Prologue good places for this? Sure, if you haven't started or want to start over.

My personal grinding point for this and all the other "kill with skill" achievements was the Tie Fighter Factory, right at the beginning at the level. You spawn in a hallway with some droids (wipe them out if you haven't grabbed the kill 35 droids achievement; oh yeah, and the droids of my enemies are my enemies so they totally count as kills too), and once you get to the end of this hall, you bust the door open with Force Push, and you're in a room with some rebels and some Stormtroopers. At the far end of the walkway where you enter is an unlimited force powerup.

Force Repulse is where you hold LT and press B and a nice unseen explosion throws everyone away from you. This one has less of an issue with bolt deflection, but you can still reset the yellow talent spheres in Force Upgrades under the pause menu and build them all back up except Defense Mastery to lower your ability to deflect the bolts.

Clear the room which is about 40 or so enemies (nearly 50 if you grab the six droids in the hallway as well; yeah, the droids of my enemies are my enemies). Pause the game. Save it. Select Mission Select, then Tie Fighter Factory, and then Load Previous Save. You'll start at the beginning of that droid hallway. Do it again and again and again until you get the achievement, then pick your next skill, and do it again.

How long will it take? Depends on how many you did during the story since this method at least respects that you probably have some kills on it. Happy grinding.

Play Prologue on new game!! I suggest waiting at the first bridge after the one is destroyed by the tie fighter. they will keep jumping over to it and seem to spawn a little longer for I kept running out of them before the cheevo would pop but it may just be me.

Change difficulty to sith master because Vader can not die in the prologue and you will have less chance of killing enemies with saber deflect! Also if they enemies stop spawning like they did for me just leaving you three random dudes coming every once and a while make sure to save and then quit and pick up on last checkpoint because it will save your kills.