Halo 3

For this you must get 5 sword kills IN A ROW IN ONE LIFE. don't be tempted to use stickys or anything. This can be a tricky achievement with a shotgun on the map and ALOT of plasma grenades, the key is be patient, act like a ninja. wait around corners and don't hesitate to hide and be cheap, if you charge someone they can easily run backwards and shoot or stick you, just be patient. If you lose sword, don't get frustrated, just grab the shotgun and kill him or ask for your team-mates help.

Basically just camp and wait for the big battle for the sword to stop at the beginning of the game, and if an enemy gets it just stay back and kill them. A good place to hide is in the bottom one of the bases.Just crouch behind that big map looking thing so you aren't visible. Keep a close watch on your radar. If you see an enemy above you, just go up the grav lift and lunge at them in the air. Drop back down behind the map thing after every kill. Enemies coming through directly in front of you should be very easy to kill.

NOTE: There IS a shot gun on the map so watch out.

on this achievement i got slightly lucky it was a capture the flag map and i rushed for the sword and got a triple straight off but what you do is get the sword and wait near the flag on the back because theres a slight ledge you can stand on and not be seen if your patient enough this achievement will come

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".

You might have to camp to get 5 kills in a row with the sword if you are not very good.

Unfortunately, this map rarely comes up with Swords. So, you'll have to know how to sneak around with the sword. Kill people that are not looking at you. Only try to kill off people that are alone. You don't want to die because the other person has a shotgun. Also, try to grab the shotgun as well because that is the "anti-sword" weapon.

Like I said, crouch and sneak around.