This is a story related achievement from the Fable: The Lost Chapters content. To earn this achievement you must kill the last boss in the game. I won't spoil who it is, but it was, for me, the toughest fight in the game. To be fair though, it was not all that tough.
I just kept my physical shield up and popped mana potions as needed. I had 9 resurrection phials, but never even needed to use a health potion, much less one of these (still, it's nice to keep 'em just in case). At about half health, the boss will start summoning allies.
***I wanted to keep this guide as spoiler free as possible. Also, everyone plays differently so there are many possible ways for you to handle this fight. I want to encourage people to use the comment section as a place to post your own strategies (keep it short please
) and experiences. Note: Others may disregard my attempt at being spoiler free, so if you look at the comments for tips and tricks, may see a name or description that you can't un-see.***