Here is the full list of all 51 Assassin's Creed II trophies - there are 34 bronze, 15 silver, 1 gold and 1 platinum.
Perform an Air Assassination on a Poisoned NPC.
Spend 5000 florins on Courtesans.
Tint your clothes with those colors: Wetland Ebony and Wetland Ivory.
Toss more than 300 florins on the ground.
Escape the hideout.
Complete DNA Sequence 14.
Pickpocket 1000 Florins.
Hide 5 dead bodies in a Bale of Hay.
Get all Hidden Blades, Item Pouches and Armor upgrades for Ezio.
Complete DNA Sequence 11.
Complete DNA Sequence 10.
Reach 80% of your stronghold's total value.
Discover the Assassin's Tomb inside Santa Maria della Visitazione.
Unlock all 20 pieces of Subject 16's video.
Complete DNA Sequence 9.
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.
Buy a Painting from Florence and Venice.
Complete training and reenter the Animus.
Complete DNA Sequence 6.
Discover the Assassin's Tomb inside the Rocca di Ravaldino fortress.
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).
Win a race against thieves!
Find the 8 statuettes in Monteriggioni.
Discover the Assassin's Tomb inside the catacombs under Santa Maria Novella.
Intercept a Borgia Courrier.
Upgrade a building in the Stronghold.
Sprint for 100 meters.
Complete DNA Sequence 3.
Complete DNA Sequence 2.
Synchronize 10 View Points.
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.
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.
Unlock all trophies.
Stun 4 guards at once by throwing sand in their face.
Kill 10 enemies while remaining in conflict without being hit.
Sweep 5 guards at once by using a Long Weapon.
Wear the Auditore cape in each city.
Collect all the Feathers.