Accomplish the indicated achievement to get the corresponding number of Gamerscore points:

The Birth of an Assassin (20 points): Be reborn as Ezio Auditore Da Firenze.
Arrivederci Abstergo (20 points): Break out of Abstergo.
Welcome to the Animus 2.0 (20 points): Enter the Animus 2.0.
The Pain of Betrayal (30 points): Complete DNA Sequence 1.
Vengeance (30 points): Complete DNA Sequence 2.
Exit the Son (30 points): Complete DNA Sequence 3.
Bloody Sunday (30 points): Complete DNA Sequence 4.
Undertaker (20 points): Discover the Assassin's Tomb inside the catacombs under Santa Maria Novella.
The Conspirators (30 points): Complete DNA Sequence 5.
An Unexpected Journey (30 points): Complete DNA Sequence 6.
Bleeding Effect (30 points): Complete training and reenter the Animus.
The Merchant of Venice (30 points): Complete DNA Sequence 7.
The Impenetrable Palazzo (30 points): Complete DNA Sequence 8.
Masquerade (30 points): Complete DNA Sequence 9.
Bianca's Man (30 points): Complete DNA Sequence 10.
The Prophet (30 points): Complete DNA Sequence 11.
The Vault (30 points): Complete DNA Sequence 14.
An Old Friend Returns (100 points): Escape the hideout.
Myth Maker (5 points): Find the 8 statuettes in Monteriggioni.
Vitruvian Man (20 points): Unlock all 20 pieces of Subject 16's video.
Street Cleaner (10 points): Hide 5 dead bodies in a Bale of Hay.
Fly Swatter (5 points): Kick a Guard while using the Flying Machine.
Messer Sandman (10 points): Stun 4 guards at once by throwing sand in their face.
Doctor (20 points): Perform an Air Assassination on a Poisoned NPC.
No-hitter (20 points): Kill 10 enemies while remaining in conflict without being hit.
Kleptomaniac (10 points): Pickpocket 1000 Florins.
Lightning Strike (10 points): Sprint for 100 meters.
Sweeper (10 points): Sweep 5 guards at once by using a Long Weapon.
Venetian Gladiator (20 points): Discover the Assassin's Tomb inside Santa Maria della Visitazione.
I can see your house from here! (20 points): Discover the Assassin's Tomb inside the Torre Grossa.
Hallowed be thy name (20 points): Discover the Assassin's Tomb inside the Basilica di San Marco.
Prison Escape (20 points): Discover the Assassin's Tomb inside the Rocca di Ravaldino fortress.
Choir Boy (20 points): Discover the Assassin's Tomb inside Santa Maria del Fiore (The Duomo).
Assassin For Hire (10 points): Complete your first assassination mission for Lorenzo Il Magnifico.
Macho Man (10 points): Defend a woman's honor.
Steal Home (10 points): Win a race against thieves!
Show your Colors (10 points): Wear the Auditore cape in each city.
Handy Man (10 points): Upgrade a building in the Stronghold.
I like the view (10 points): Synchronize 10 View Points.
High Dive (10 points): Perform a Leap of Faith from the Top of Florence's Giotto's Campanile.
Mailman (10 points): Intercept a Borgia Courrier.
Tip of the Iceberg (10 points): Use your Eagle Vision to scan a Glyph in the environment.
A Piece of the Puzzle (10 points): Unlock a piece of Subject 16's video.
Art Connoisseur (10 points): Buy a Painting from Florence and Venice.
Podestà of Monteriggioni (30 points): Reach 80% of your stronghold's total value.
Perfect Harmony (10 points): Tint your clothes with those colors: Wetland Ebony and Wetland Ivory.
In Memory of Petruccio (30 points): Collect all the Feathers.
Red Light Addict (10 points): Spend 5000 florins on Courtesans.
Man of the People (10 points): Toss more than 300 florins on the ground.
Victory lies in preparation (10 points): Get all Hidden Blades, Item Pouches and Armor upgrades for Ezio.