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.
Escape the hideout.
Complete DNA Sequence 14.
Discover the Assassin's Tomb inside the Basilica di San Marco.
Discover the Assassin's Tomb inside Santa Maria della Visitazione.
Discover the Assassin's Tomb inside the Rocca di Ravaldino fortress.
Wear the Auditore cape in each city.
Complete DNA Sequence 11.
Collect all the Feathers.
Get all Hidden Blades, Item Pouches and Armor upgrades for Ezio.
Complete DNA Sequence 10.
Unlock all 20 pieces of Subject 16's video.
Sweep 5 guards at once by using a Long Weapon.
Complete DNA Sequence 9.
Complete DNA Sequence 8.
Kick a Guard while using the Flying Machine.
Stun 4 guards at once by throwing sand in their face.
Reach 80% of your stronghold's total value.
Complete DNA Sequence 7.
Perform an Air Assassination on a Poisoned NPC.
Kill 10 enemies while remaining in conflict without being hit.
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.
Spend 5000 florins on Courtesans.
Complete DNA Sequence 5.
Win a race against thieves!
Complete your first assassination mission for Lorenzo Il Magnifico.
Complete DNA Sequence 4.
Discover the Assassin's Tomb inside the Torre Grossa.
Discover the Assassin's Tomb inside Santa Maria del Fiore (The Duomo).
Toss more than 300 florins on the ground.
Intercept a Borgia Courrier.
Synchronize 10 View Points.
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.
Complete DNA Sequence 1.
Defend a woman's honor.
Perform a Leap of Faith from the Top of Florence's Giotto's Campanile.
Sprint for 100 meters.
Pickpocket 1000 Florins.
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.