Halo 3

If you are good at swords, then this is easy to get in Lone Wolves because it now has a swords free-for-all. Most people just rush in to where the fighting is. This means it will not be hard to find three people to kill. The trick is winning the sword fights. It is important to use the sword melee as well as the lunge attack. The melee is faster and still kills in one slice. Using the boxer control setup and increasing look sensitivity can be helpful as well.

When a "swords" match pops up, wait a second or two before rushing into the fray near the center of the map. One or two people will be stunned from a parry (two people simultaneously lunging), and you should be able to kill both of them before they can recover to fight back. Optimally, melee one in the back and lunge at the second (The melee takes slightly less time, so it's less likely that you'll be countered.) After that, you have four seconds to get a kill, so in a 6 player match on a small map, that should only take a small bit of luck.

I got it on Epitaph, but it can be done on any map.

To be honest this is quite frustrating when you can't get a map with a sword, but if you hang it there it'll work. Obviously swords is the easiest game type to get it on but king of the hill can be quite good aswell, if you do the right thing. First find a king of the hill game type on a map with an energy sword, then, get the sword while everybody else is going for the hill then head to the hill but hang back and try not to be seen (active camo helps) then when three people are all in it, concentrating on killing eachother, run in and get them. Don't worry if this doesn't work the first time because not many people will want the sword so you can just go back and pick it up again.

Hope this helps, Josh

Tip for Boosters!

this is not a solution for the achievement, but for what comes after... (don't hate me for it, it's just to help)

If you managed to get it with the help of the Language-Trick, you'll probably have noticed that the name and description of the achievement is not English (or whatever).
To solve this you need to do the following for pre-NXE:
1. Go to the Xbox-dashboard
2. Navigate to the "Marketplace" blade
3. Press "X" to Sign Out, confirm it with Yes
4. Go to "Recover Account"
5. Enter your Gamertag and Continue
6. Put in your NET password and ID and continue
7. Wait for it to recover and check your English Achievements

for NXE:
1. Go to the Xbox-Dashboard
2. Press the Xbox-guide button
3. Press "X" to Sign Out, confirm with "Yes, sign out"
4. Click the "Recover Gamertag" button, and again.
5. Confirm to exit your current session with "Yes"
6. Enter your Gamertag and Continue
7. Enter your Live ID and your password and Sign In
8. Accept the Xbox LIVE Terms of Use and Privacy Statement
9. Wait until your profile is downloaded and check your English Achievements

The solution is not invented by me, although I wrote down the NXE version with the help of the following webpage: http://www.myxboxspot.com/forums/halo-3-glitches/1387-how-ch...
The pre-NXE solution is a retyped and shortened version of the idea that can be found on the same webpage, I have copied it because I wanted to spread the word about this solution.

Almost all multiplayer maps have a sword or a hammer hidden somewhere. I found this one easiest on the close-quarters maps instead of long range ones. Just wait until enemies start attacking each other then go in for the kill.

This is not an easy achievement to earn by far.

This achievement can be easily won with patience and a sword.... well of course it has to be a sword, nothing else. This is probably best to get on Epitaph because everyone gathers around in the middle of the map. Just wait for the 2-3 people to get into combat and Lunge(RT) at one person then Melee(B) the other person while they were lunging at your victim and with all that noise it should attract another victim to come to attack then just spam both the (B) button and (RT) in hopes to get your third (3rd) kill in a row in under four(4) seconds. This can also cause you to get the Triple Kill achievement and get you a piece of armor for your elite character. Hope that you like your new armor and this nifty guide. Happy Achievement Hunting

This is VERY easy to do in Swords gametype. Hit B instead or RT to do sword swings. This moves much faster. And crouch to counter "B spammers".