Item description:

First of all, you're welcome. This was perhaps one of the most challenging/stupid achievements ever.

ONE HUNDRED PERCENT OF ALL DOG TAGS HAVE BEEN COLLECTED.
All that is left is for you to murder your maker, Solidus... with only an inch of your life remaining.
But fear not, if you fail again and again, I'll give you a few tips.

- BODY ARMOR? FUCK YEAH.
Always wear body armor, it will save you if you are hit by a slice or two.

- BLOCKING IS YOUR FRIEND!!!
Always block! Slash at Solidus after almost every attack!

- JUMP OF A LEDGE!!!
If he fires missiles at you, you can attempt to slash at them like a boss...
or pussy out like I did and jump of the nearby ledge.
Don't worry, Raiden catches the ledge and the missiles will pummel the ground in front of you instead.
Then hop back up just in time to slash some more.

- ON FIRE? DROP IT LIKE IT'S HOT!
If you're even on fire, switch from body armor to the B.D.U. and back again.
It magically puts out the flames like a fire blanket... except fire blankets aren't magical.

- BLEEDING LIKE IT'S THAT TIME OF THE MONTH??
Crouch down after hitting Solidus to the ground.
That will give you a few vial seconds to recover your life. Hop back up and BLOCK.

Yup, that's pretty much it.
Anyways, please give rep and whatnot. I beg of thee, it's the least you can do for me.
All credit for this save belongs to NegativeONE. Good luck!