You cannot unlock the harlequin and instead must pre-order through GameStop. That is the only way I know to get him.
Yes you can. The character you unlock is the helequin, not to be mistaken for the harlequin. I think this character costs 40 Uplay points. This information may not be completely accurate but im fairly sure it is.
You play the game!
find 6 keys of romulous
There are four cahracters for you to unlock but you start with ten default characters.
if you mean in brotherhood u unlock it by destroying all of Leonardo's war machines and going to one of his benches
More Lairs will become available as you progress in the campaign.
You must get 100% sync in DNA sequence 6.
u cannot get the medici cape in AC brotherhood u get it in AC 2 u get it after u killed the pazzi family
You cannot unlock the costume in game. The only way to unlock the costume is by spending Uplay points through the in-game interface.
The Highest Level you can get to is Level 50
The only official "secret areas" are the Lairs of Romulus, which you can complete to unlock the Armour of Brutus and the Dagger of Brutus.
By buying the DLC in the game or by buying the pre-order edition,da vinci disappearance editon