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.
Escape the hideout.
Complete DNA Sequence 14.
Complete DNA Sequence 11.
Wear the Auditore cape in each city.
Win a race against thieves.
Collect all the Feathers.
Unlock all 20 pieces of Subject 16's video.
Complete DNA Sequence 10.
Kill 10 enemies while remaining in conflict without being hit.
Sweep 5 guards at once by using a Long Weapon.
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 Santa Maria della Visitazione.
Discover the Assassin's Tomb inside the Basilica di San Marco.
Complete DNA Sequence 8.
Kick a Guard while using the Flying Machine.
Complete DNA Sequence 7.
Reach 80% of your stronghold's total value.
Discover the Assassin's Tomb inside the Rocca di Ravaldino fortress.
Discover the Assassin's Tomb inside the Torre Grossa.
Perform an Air Assassination on a Poisoned NPC.
Spend 5000 florins on Courtesans.
Buy a Painting from Florence and Venice.
Intercept a Borgia Courrier.
Tint your clothes with those colors: Wetland Ebony and Wetland Ivory.
Toss more than 300 florins on the ground.
Complete training and reenter the Animus.
Complete DNA Sequence 6.
Complete DNA Sequence 5.
Complete your first assassination mission for Lorenzo Il Magnifico.
Complete DNA Sequence 4.
Discover the Assassin's Tomb inside Santa Maria del Fiore (The Duomo).
Discover the Assassin's Tomb inside the catacombs under Santa Maria Novella.
Upgrade a building in the Stronghold.
Find the 8 statuettes in Monteriggioni.
Complete DNA Sequence 3.
Hide 5 dead bodies in a Bale of Hay.
Complete DNA Sequence 2.
Pickpocket 1000 Florins.
Defend a woman's honor.
Synchronize 10 View Points.
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.
Sprint for 100 meters.
Enter the Animus 2.0.
Break out of Abstergo.
Be reborn as Ezio Auditore Da Firenze.