There is no guide for this game yet. But apparently it is EASY 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