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