Hello Ownedcore, this is my first time contributing!
First off you need [Fire-Watcher's Oath]
Now to the exploit/bugg, so I was running a dungeon with the [Fire-Watcher's Oath] which transforms you to a Ordon Fire-Watcher and noticed that I started getting the Bloody Coins achievement at random, there is a 2000 Bloody Coin (hotfixed) achievement that gives you a title (Fire-Watcher)
So to sum this up,
1. Use your Fire-Watcher's Oath
2 .Run random dungeons (or just kill alot of mobs in world?)
3. Get your title?
No pvp needed!
Screenshot of me getting the title from Stormshout Brewery: https://i.imgur.com/ZgugjDl.jpg