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.
Unlock all 20 pieces of Subject 16's video.
Win a race against thieves!
Buy a Painting from Florence and Venice.
Sweep 5 guards at once by using a Long Weapon.
Stun 4 guards at once by throwing sand in their face.
Find the 8 statuettes in Monteriggioni.
Perform an Air Assassination on a Poisoned NPC.
Tint your clothes with those colors: Wetland Ebony and Wetland Ivory.
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.
Spend 5000 florins on Courtesans.
Complete DNA Sequence 9.
Pickpocket 1000 Florins.
Reach 80% of your stronghold's total value.
Discover the Assassin's Tomb inside Santa Maria della Visitazione.
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.
Complete training and reenter the Animus.
Complete DNA Sequence 6.
Discover the Assassin's Tomb inside the Rocca di Ravaldino fortress.
Perform a Leap of Faith from the Top of Florence's Giotto's Campanile.
Complete DNA Sequence 5.
Toss more than 300 florins on the ground.
Kill 10 enemies while remaining in conflict without being hit.
Unlock a piece of Subject 16's video.
Use your Eagle Vision to scan a Glyph in the environment.
Discover the Assassin's Tomb inside the Torre Grossa.
Synchronize 10 View Points.
Complete your first assassination mission for Lorenzo Il Magnifico.
Complete DNA Sequence 4.
Intercept a Borgia Courrier.
Discover the Assassin's Tomb inside Santa Maria del Fiore (The Duomo).
Defend a woman's honor.
Discover the Assassin's Tomb inside the catacombs under Santa Maria Novella.
Hide 5 dead bodies in a Bale of Hay.
Upgrade a building in the Stronghold.
Complete DNA Sequence 3.
Sprint for 100 meters.
Complete DNA Sequence 2.
Complete DNA Sequence 1.
Enter the Animus 2.0.
Break out of Abstergo.
Be reborn as Ezio Auditore Da Firenze.