Here is the full list of all 51 Assassin's Creed II trophies - there are 34 bronze, 15 silver, 1 gold and 1 platinum.
Unlock all trophies.
Kill 10 enemies while remaining in conflict without being hit.
Wear the Auditore cape in each city.
Collect all the Feathers.
Sweep 5 guards at once by using a Long Weapon.
Stun 4 guards at once by throwing sand in their face.
Unlock all 20 pieces of Subject 16's video.
Spend 5000 florins on Courtesans.
Perform an Air Assassination on a Poisoned NPC.
Find the 8 statuettes in Monteriggioni.
Escape the hideout.
Complete DNA Sequence 14.
Get all Hidden Blades, Item Pouches and Armor upgrades for Ezio.
Reach 80% of your stronghold's total value.
Complete DNA Sequence 11.
Complete DNA Sequence 10.
Complete DNA Sequence 9.
Discover the Assassin's Tomb inside Santa Maria della Visitazione.
Complete DNA Sequence 8.
Kick a Guard while using the Flying Machine.
Discover the Assassin's Tomb inside the Basilica di San Marco.
Complete DNA Sequence 7.
Hide 5 dead bodies in a Bale of Hay.
Pickpocket 1000 Florins.
Buy a Painting from Florence and Venice.
Complete training and reenter the Animus.
Complete DNA Sequence 6.
Tint your clothes with those colors: Wetland Ebony and Wetland Ivory.
Discover the Assassin's Tomb inside the Rocca di Ravaldino fortress.
Complete DNA Sequence 5.
Complete your first assassination mission for Lorenzo Il Magnifico.
Intercept a Borgia Courrier.
Win a race against thieves!
Discover the Assassin's Tomb inside the Torre Grossa.
Toss more than 300 florins on the ground.
Complete DNA Sequence 4.
Discover the Assassin's Tomb inside Santa Maria del Fiore (The Duomo).
Defend a woman's honor.
Discover the Assassin's Tomb inside the catacombs under Santa Maria Novella.
Synchronize 10 View Points.
Upgrade a building in the Stronghold.
Sprint for 100 meters.
Complete DNA Sequence 3.
Complete DNA Sequence 2.
Unlock a piece of Subject 16's video.
Use your Eagle Vision to scan a Glyph in the environment.
Complete DNA Sequence 1.
Perform a Leap of Faith from the Top of Florence's Giotto's Campanile.
Enter the Animus 2.0.
Break out of Abstergo.
Be reborn as Ezio Auditore Da Firenze.