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.
Unlock all 20 pieces of Subject 16's video.
Wear the Auditore cape in each city.
Collect all the Feathers.
Sweep 5 guards at once by using a Long Weapon.
Tint your clothes with those colors: Wetland Ebony and Wetland Ivory.
Buy a Painting from Florence and Venice.
Stun 4 guards at once by throwing sand in their face.
Perform an Air Assassination on a Poisoned NPC.
Pickpocket 1000 Florins.
Hide 5 dead bodies in a Bale of Hay.
Spend 5000 florins on Courtesans.
Get all Hidden Blades, Item Pouches and Armor upgrades for Ezio.
Toss more than 300 florins on the ground.
Escape the hideout.
Complete DNA Sequence 14.
Complete DNA Sequence 11.
Discover the Assassin's Tomb inside the Rocca di Ravaldino fortress.
Reach 80% of your stronghold's total value.
Complete DNA Sequence 10.
Discover the Assassin's Tomb inside the Basilica di San Marco.
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.
Complete DNA Sequence 7.
Complete training and reenter the Animus.
Complete DNA Sequence 6.
Complete DNA Sequence 5.
Discover the Assassin's Tomb inside the Torre Grossa.
Complete your first assassination mission for Lorenzo Il Magnifico.
Complete DNA Sequence 4.
Discover the Assassin's Tomb inside Santa Maria del Fiore (The Duomo).
Intercept a Borgia Courrier.
Discover the Assassin's Tomb inside the catacombs under Santa Maria Novella.
Upgrade a building in the Stronghold.
Complete DNA Sequence 3.
Find the 8 statuettes in Monteriggioni.
Complete DNA Sequence 2.
Unlock a piece of Subject 16's video.
Use your Eagle Vision to scan a Glyph in the environment.
Synchronize 10 View Points.
Win a race against thieves!
Complete DNA Sequence 1.
Defend a woman's honor.
Sprint for 100 meters.
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.