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