In Assassin’s Creed: Brotherhood for the PS3, Xbox 360, and PC, you can unlock several different weapons for your character to use by completing various different tasks.
Bartolomeo’s Axe – Get each guild to level three
Captain’s Sword – Complete the Faith shop quest from the Blacksmith
Cavalieri Butcher Knife – Open five Blacksmiths in the Rebuilding Rome mini-game
Cavalieri Mace – Open five Blacksmiths in the Rebuilding Rome mini-game
Dagger of Brutus – Collect all six Keys of Romulus from the Followers’ Lairs beneath Prospero da Siena’a Borgia Tower
La Volpe’s Bite – Get each guild to level three
Maria’s Dagger – Get each guild to level three
Spada Lunga – Complete the Blood Money shop quest from the Blacksmith
Spadone Longsword – Open ten Blacksmiths in the Rebuilding Rome mini-game
Sword of Altair – Complete all Assassin’s Guild challenges