Mine would have to be:
1) Assassin's Creed II
2) Assassin's Creed IV Black Flag
3) Assassin's Creed Syndicate
4) Assassin's Creed Brotherhood
5) Assassin's Creed Unity
6) Assassin's Creed III: Liberation
7) Assassin's Creed Revelations
8) Assassin's Creed III
9) Assassin's Creed