Assassin's Creed 4: Black Flag Infinite Money Cheat [Patched]
It appears that this cheat no longer works, unless you're working on an unpatched Xbox 360. There are ways around this patching, but honestly, I would suggest going through and patching the game, and unfortunately, losing this cheat.
Money is important in Assassin's Creed 4: Black Flag. You're a pirate. This cheat will, unless they "fix" it, allow you to collect infinite money in-game.
This isn't the kind of cheat where you press a button and gain infinite money immediately. You have to do a little work.
There is a point in the game (Sequence 2: Memory 3) where your character interacts with three Templar knights. These knights are standing around a table discussing nefariously their intentions with the Observatory. While they are standing there, there is an optional objective that you can complete involving pick pocketing all three Templars.
To activate this cheat, pick pocket all three Templars. This is done by pressing the "B" button while standing next to the three men.
After you pickpocket the Templars, simply reload the memory from the last checkpoint. Your money is persistent, meaning even though you go back in time, you can continue to collect money. As far as I can tell, you can do this as many times as you want (or as long as you can stomach the opening dialogue of the scene by the Templar Grandmaster.)
I only did the scene a few times, but managed to make a little over 20000R. So about enough to buy one upgrade on the Jackdaw or a new pair of pistols for Edward. Still not bad, and I'd definitely suggest trying it out if you're strapped for cash.
If you've passed this point in the game, no fear! You can just use the animus to go back to Sequence 2: Memory 3 to retrieve all of the money you'll ever need.