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.
Kill 10 enemies while remaining in conflict without being hit.
Sweep 5 guards at once by using a Long Weapon.
Stun 4 guards at once by throwing sand in their face.
Escape the hideout.
Complete DNA Sequence 14.
Complete DNA Sequence 11.
Get all Hidden Blades, Item Pouches and Armor upgrades for Ezio.
Complete DNA Sequence 10.
Unlock all 20 pieces of Subject 16's video.
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.
Reach 80% of your stronghold's total value.
Spend 5000 florins on Courtesans.
Discover the Assassin's Tomb inside the Basilica di San Marco.
Complete DNA Sequence 7.
Perform an Air Assassination on a Poisoned NPC.
Buy a Painting from Florence and Venice.
Discover the Assassin's Tomb inside the Rocca di Ravaldino fortress.
Tint your clothes with those colors: Wetland Ebony and Wetland Ivory.
Discover the Assassin's Tomb inside the Torre Grossa.
Discover the Assassin's Tomb inside Santa Maria del Fiore (The Duomo).
Intercept a Borgia Courrier.
Complete training and reenter the Animus.
Complete DNA Sequence 6.
Complete DNA Sequence 5.
Hide 5 dead bodies in a Bale of Hay.
Win a race against thieves!
Complete your first assassination mission for Lorenzo Il Magnifico.
Complete DNA Sequence 4.
Toss more than 300 florins on the ground.
Pickpocket 1000 Florins.
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.
Sprint for 100 meters.
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.