If you played Assassin’s Creed, then you know that Desmond Miles was being hunted by the other assassins. Assassin's Creed 2 is a new version that is a continuation of the first. Desmond Miles is still there and still trying to escape the assassins but there are more twists to the story.
Your goal will be to control Desmond and escape the assassins. However, more duels and fights against between Desmond and his friends are expected. As you move in the game, the suspense and emotion build up. The numbers of weapons you can choose from have also been increased.
Assassin's Creed 2 keeps the same visual and sound effect of the first version but with a slight improvement. Anything else is the same as in Assassin’s Creed. You should definitely play Assassin's Creed 2 to find out what happens to Desmond Miles.