Finish Assassin's Creed IV: Black Flag

Ezio Auditore in Renaissance Florence and Venice; the game that made the series.

Ezio in Rome, an assassin guild and the first multiplayer; the tightest Assassin's Creed.

Altair in the Third Crusade; the first Animus, and nine identical viewpoints.

Connor in the American Revolution, with naval battles and a rope dart.

Revolutionary Paris rendered building by building, once the patches landed.

Victorian London, a grappling hook and twins who share the story.

Ezio in Constantinople as an old man, closing his own story and finally Altair.

Kassandra in the Peloponnesian War; the Assassin's Creed that became an RPG.