What is the secret achievement for assassin's creed?

The Secret Achievements are the achievements that are achieved by progresing through the game and uncovering more of the plot. The reason they're all Secret is that the plot of the game would be spoiled by describing the achievements to you. You can only see the description of them once you have unlocked them so that the plot isn't spoiled. They are: * The Blood of a Corrupt Merchant * The Blood of a Doctor * The Blood of a Slave Trader * The Blood of a Merchant King * The Bllood of a Liege Lord * The Blood of a Regent * The Blood of a Teutonic Leader * The Blood of a Scribe * The Blood of a Nemisis