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.
Spend 5000 florins on Courtesans.
Tint your clothes with those colors: Wetland Ebony and Wetland Ivory.
Discover the Assassin's Tomb inside the Basilica di San Marco.
Kill 10 enemies while remaining in conflict without being hit.
Stun 4 guards at once by throwing sand in their face.
Discover the Assassin's Tomb inside the Rocca di Ravaldino fortress.
Hide 5 dead bodies in a Bale of Hay.
Toss more than 300 florins on the ground.
Wear the Auditore cape in each city.
Unlock all 20 pieces of Subject 16's video.
Collect all the Feathers.
Sweep 5 guards at once by using a Long Weapon.
Perform an Air Assassination on a Poisoned NPC.
Find the 8 statuettes in Monteriggioni.
Get all Hidden Blades, Item Pouches and Armor upgrades for Ezio.
Reach 80% of your stronghold's total value.
Escape the hideout.
Complete DNA Sequence 14.
Pickpocket 1000 Florins.
Complete DNA Sequence 11.
Win a race against thieves.
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.
Complete DNA Sequence 7.
Buy a Painting from Florence and Venice.
Complete training and reenter the Animus.
Complete DNA Sequence 6.
Discover the Assassin's Tomb inside Santa Maria del Fiore (The Duomo).
Complete DNA Sequence 5.
Intercept a Borgia Courrier.
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.
Complete your first assassination mission for Lorenzo Il Magnifico.
Complete DNA Sequence 4.
Discover the Assassin's Tomb inside the catacombs under Santa Maria Novella.
Sprint for 100 meters.
Upgrade a building in the Stronghold.
Complete DNA Sequence 3.
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.
Defend a woman's honor.
Enter the Animus 2.0.
Break out of Abstergo.
Be reborn as Ezio Auditore Da Firenze.