Assassin's Creed II Cheats

Choir Boy (Bronze Trophy) (The Duomo): Discover the Assassin's Tomb inside Santa Maria del Flore
Assassin for Hire (Bronze Trophy): Complete your first assassination mission for Lorenzo Il Magnifico
Macho Man (Bronze Trophy): Defend a woman's honor
Steal Home (Bronze Trophy): Win a race against thieves!
Show your Colors (Bronze Trophy): Wear the Auditore cape in each city
Handy Man (Bronze Trophy): Upgrade a building in the Stronghold
I like the view (Bronze Trophy): Synchronize 10 View Points
High Dive (Bronze Trophy): Perform a Leap of Faith from the Top of Florence's Glotto's Campanile
Mailman (Bronze Trophy): Intercept a Borgia Courrier
Tip of the Iceberg (Bronze Trophy): Use your Eagle Vision to scan a Glyph in the environment
A Piece of the Puzzle (Bronze Trophy): Unlock a piece of Subject 16's video
Art Connoisseur (Bronze Trophy): Buy a Painting from Florence and Venice
Podestà of Monteriggioni (Bronze Trophy): Reach 80% of the your stronghold's total value
Perfect Harmony (Bronze Trophy): Tint your clothes with those colors: Wetland Ebony and Wetland Ivory
In Memory of Petruccio (Bronze Trophy): Collect all the Feathers
Red Light Addict (Bronze Trophy): Spend 5000 florins on Courtesans
Man of the People (Bronze Trophy): Toss more than 300 florins on the ground
Victory lies in preparation (Bronze Trophy): Get all Hidden Blades, Item Pouches and Armor upgrades for Ezio
Welcome to the Animus 2.0 (Silver Trophy): Enter the Animus 2.0
The Pain of Betrayal (Silver Trophy): Complete DNA Sequence 1
Vengeance (Silver Trophy): Complete DNA Sequence 2
Exit the Son (Silver Trophy): Complete DNA Sequence 3
Bloody Sunday (Silver Trophy): Complete DNA Sequence 4
Undertaker (Silver Trophy): Discover the Assassin's Tomb inside the catacombs under Santa Maria Novella
The Conspirators (Silver Trophy): Complete DNA Sequence 5
An Unexpected Journey (Silver Trophy): Complete DNA Sequence 6
Bleeding Effect (Silver Trophy): Complete training and reenter the Animus
The Merchant of Venice (Silver Trophy): Complete DNA Sequence 7
The Impenetrable Palazzo (Silver Trophy): Complete DNA Sequence 8
Masquerade (Silver Trophy): Complete DNA Sequence 9
Blanca's Man (Silver Trophy): Complete DNA Sequence 10
The Prophet: Complete DNA Sequence 11 (Silver Trophy0
The Vault (Silver Trophy): Complete DNA Seqeunce 14
An Old Friend Returns (Gold Trophy): Escape the hideout
Master Assassin (Platinum Trophy): Unlock all trophies

Collecting Feathers
Just collect feathers within the game to unlock the items following. After collecting the amount needed to unlock an item just put it in the box in your villa and talk to your mother.

Auditore Cape: Collect 100 Feathers
Condottiero War Hammer: Collect 50 Feathers

Giant Squid
In the assassin's tomb Santa Maria Delle Visitazione , before the room in which you get one of the seals required for the Armour of Altair , is a large room filled with water in where you go through an obstacle course . Now before attempting the course , activate the lever and stand on the edge of the floor and stare into the water . After waiting for about a minute , a large figure in the water appears to swim across while staring at you with what appears to be a yellow eye . After the lever's time limit runs out , re activate it and stand on the same spot and wait . A giant tentacle will shoot out of the water that Ezio dodges at the last second.

Assassin's Creed: Bloodlines Unlockable Weapons
Players may unlock bonus weapons by syncing save data from the Assassin's Creed: Bloodlines PSP game with Assassin's Creed II on the PS3. Connect the PSP to the PS3 via a USB cable, with BOTH games running. Then, select "Connectivity" from the Assassin's Creed II options menu, and "Connect to PS3" from Assassin's Creed: Bloodlines. The games will evaluate each others' save data and unlock in-game weapons and bonuses based on the player's progress. A complete story-mode playthrough of Assassin's Creed: Bloodlines will unlock six weapons that will be stored at the villa.

Bouchart's Blade: Defeat Armand Bouchart in Assassin's Creed Bloodlines
Dark Oracle's Bone Dagger: Defeat the Dark Oracle in Assassin's Creed Bloodlines
Fredrick's Hammer: Defeat Fredrick the Red in Assassin's Creed Bloodlines
Mace of the Bull: Defeat the Bull in Assassin's Creed Bloodlines
Maria Thorpe's Longsword: Defeat Maria Thorpe in Assassin's Creed Bloodlines
Twins' Blade: Defeat the Twins in Assassin's Creed Bloodlines