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