Halo 3

Set up Lone Wolves and keep playing until you get a match on Narrows, preferably King of the Hill. Head over to the man cannon and pick up the Needler. Then, simply go back and forth between the cannons while unloading on people on the bridge. Only focus on one person at a time, though, and you should be able to kill him. You don't even have to worry about ammo because once you land it will refill since you are stepping on another Needler.

After you land, you may be able to get a clear view of a hill location to your left or right, depending on where it is at the moment. You will have to jump, facing the snipe spawn, to see over the ledge. You may get lucky if you throw a few grenades and get some shots in there, but do not do anything too risky. Going back and forth between the man cannons hardly ever draws attention because people want to get to the hill and you are only slowly killing people off.

This picture from haloforever.com shows where the Needler if you do not already know. It should be the exact same on the other side.



Hope it helps.

Watch this video, it's very helpful. Read my tips underneath for even more detail.

For experienced players this is quite easy as they know the maps well and position thereselves to their advantage with good weapons. This has to be done in the Lone Wolves playlist and you have to get 10 kills without dying to get the Killing Frenzy medal.
For an advantage you should use power weapons. These include the rocket launcher, energy sword, sniper rifle/beam rifle and shotgun. If you do pick up one of these then don't get too cocky running round the map 'cause you can still die. The sniper/beam rifle require the most skill. I'd stick to the shotgun in a close range map for example: Guardian and Snowbound. Try not to go into the open where you are an easy target. This brings me to my next point.
Camping: Staying in the same position on the map and waiting for people to come by without seeing you. Plus crouching:so you are not seen on the radar helps.
King of the hill is my preffered gametype to try this on stay back from the hill with a medium/long ranged weapon and you'll pick up kills easily. Everyone will be looking to pick up hill time so will be standing in pretty much the same position. Stealing kills is easily done on king of the hill. If you throw grenades in every now and then you will pick up kills because people will be shooting eachother where the hill is and have next to no life from their fights.
This could get frustrating but keep trying. Remember that every time you die you will learn something. If you do get cut off from your Frenzy by dying think how you could of improved on that situation and learn from it.

on a map with king of the hill just stay back and kill with long ranged weapons. focus on the achievement and not the match. i think the best place is on the pit where you can get a sniper and watch over 2 of the 3 hill spots from the sniper tower.

This video was made by a friend of mine, hopefully it works for you.

Make sure you're playing King of the Hill on The Pit for this achievement. Just go sit on a turret on one of the sniperhills. You'll have an overview of most of the hills. if not, keep waiting for the next hill. You'll get this in no-time. I got it while trying to get the Overkill achievement. xD

The easiest way I did it was with shotguns but there a whole lot of ways to get it like with every kind of gun or greandes so remember stay out of danger and sight of eniemies

Got this on The Pit (one of the easier maps) without boosting.
I simply got the energy sword and started going to town, most of the kills were lined up for me since everyone was going towards sword room. For the 4 kills I had to move out for I simply kept constant attention to my radar to see if enemies were coming at me, then proceeded to grab the active camo and killed the remaining targets. I ended up getting this, triple kill, and steppin razor in the same game.