You can't its just there for graphical purposes. There are however, "dips" around the wall but there is no way in entering.
There are no avatar awards for Assassin's Creed II. Sorry.
no i believe you cant
you must purchase them
multiplayer
An example of an Emblem for MGS4 is the Assassin Emblem. Unlock it and you get Altair's Costume from Assassin's Creed
The assassins tombs will appear as markers in your map (if you hit the back button there is a map of the whole city). just put the crosshair over an odd looking marker and it should say "assassin tomb".
no, assassin armor is a photoshop. it does not actually exist.
At level 27-ish without prestiging. But you have to complete challanges to make it Pro. The Assassin Perk is located in the Perk 2 section.
Complete the courtesans guild challenges
You have to buy Assassin's Creed 2: Black Edition.
The only way to unlock the Hellequin is to download the character from the Uplay menu.
You cannot unlock the harlequin and instead must pre-order through Gamestop. That is the only way I know to get him.