How do you beat assasin creed 2

1.Start by picking up a controller and turning on your console.

2.Then, play the game.

3.Repeat step two until you achieve the desired results.

But seriously, you can't really 'beat' the game. When you finish the plot, you can play on indefinitely. You're considered to have beaten it when you reach 100% synchronization- which is when you collect all of the treasure chests, feathers, statues, weapons, armor, upgrades, and everything else available as well as having completed all of the quests in the game (optional and compulsory).