Assassins Creed 2 doesn't allow us to replay story missions, so once you've finished the DLC there's no going back. It's still a very fun game, though, and four dollars isn't going to break the bank.
Assassinations Assassin's Creed II (Ezio Collection) | Assassinations. Assassination contracts start after finishing Memory 1 of Sequence 5. You'll be able to take part in ForAssassin's Creed: Brotherhood on the Xbox 360, a GameFAQs message board topic titled "Completed courtesan assignments. for the missions all you get is synchronisation which can lead to the "hidden memories" that are from ezios past but that's all you get from the missions and can be done without them. from the assignments however you dIbwhl.