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.
Sweep 5 guards at once by using a Long Weapon.
Collect all the Feathers.
Unlock all 20 pieces of Subject 16's video.
Kick a Guard while using the Flying Machine.
Perform an Air Assassination on a Poisoned NPC.
Kill 10 enemies while remaining in conflict without being hit.
Discover the Assassin's Tomb inside the Basilica di San Marco.
Escape the hideout.
Complete DNA Sequence 14.
Get all Hidden Blades, Item Pouches and Armor upgrades for Ezio.
Discover the Assassin's Tomb inside Santa Maria della Visitazione.
Stun 4 guards at once by throwing sand in their face.
Discover the Assassin's Tomb inside the Rocca di Ravaldino fortress.
Reach 80% of your stronghold's total value.
Discover the Assassin's Tomb inside the Torre Grossa.
Discover the Assassin's Tomb inside Santa Maria del Fiore (The Duomo).
Perform a Leap of Faith from the Top of Florence's Giotto's Campanile.
Complete your first assassination mission for Lorenzo Il Magnifico.
Synchronize 10 View Points.
Tint your clothes with those colors: Wetland Ebony and Wetland Ivory.
Complete DNA Sequence 11.
Complete DNA Sequence 10.
Complete DNA Sequence 9.
Complete DNA Sequence 8.
Complete DNA Sequence 7.
Buy a Painting from Florence and Venice.
Complete training and reenter the Animus.
Complete DNA Sequence 6.
Intercept a Borgia Courrier.
Complete DNA Sequence 5.
Spend 5000 florins on Courtesans.
Complete DNA Sequence 4.
Discover the Assassin's Tomb inside the catacombs under Santa Maria Novella.
Upgrade a building in the Stronghold.
Complete DNA Sequence 3.
Unlock a piece of Subject 16's video.
Use your Eagle Vision to scan a Glyph in the environment.
Find the 8 statuettes in Monteriggioni.
Complete DNA Sequence 2.
Win a race against thieves!
Complete DNA Sequence 1.
Sprint for 100 meters.
Defend a woman's honor.
Pickpocket 1000 Florins.
Toss more than 300 florins on the ground.
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.