Assassin´s Creed: Revelations Discussion
A lot of achievements you'll actually gain automatically as you progress through the game - as you said you get them for finishing certain sequences. but you'll get them for a certain number of kills with the hidden blade for example - but all of them are absolutely, completely and utterly optional.
* Updated game trainers and cheats daily
* Get notified when new cheats are added
* Request which games get new trainers
* Priority support with any problem