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.
Kill 10 enemies while remaining in conflict without being hit.
Stun 4 guards at once by throwing sand in their face.
Perform an Air Assassination on a Poisoned NPC.
Tint your clothes with those colors: Wetland Ebony and Wetland Ivory.
Get all Hidden Blades, Item Pouches and Armor upgrades for Ezio.
Unlock all 20 pieces of Subject 16's video.
Collect all the Feathers.
Spend 5000 florins on Courtesans.
Find the 8 statuettes in Monteriggioni.
Escape the hideout.
Complete DNA Sequence 14.
Reach 80% of your stronghold's total value.
Discover the Assassin's Tomb inside the Basilica di San Marco.
Pickpocket 1000 Florins.
Buy a Painting from Florence and Venice.
Toss more than 300 florins on the ground.
Complete your first assassination mission for Lorenzo Il Magnifico.
Defend a woman's honor.
Win a race against thieves!
Discover the Assassin's Tomb inside the Torre Grossa.
Discover the Assassin's Tomb inside Santa Maria del Fiore (The Duomo).
Discover the Assassin's Tomb inside the Rocca di Ravaldino fortress.
Complete DNA Sequence 11.
Complete DNA Sequence 10.
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.
Intercept a Borgia Courrier.
Complete DNA Sequence 7.
Complete training and reenter the Animus.
Complete DNA Sequence 6.
Complete DNA Sequence 5.
Hide 5 dead bodies in a Bale of Hay.
Sprint for 100 meters.
Synchronize 10 View Points.
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.
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.
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.