Disclaimer: This story is not just an AC and Watch Dogs crossover. It is a massive crossover from multiple games, but it will mostly just be about the Assassin's Creed Universe, with a bit of everything tossed in.

Crossover :

Assassin's Creed 3

Assassin's Creed 4: Black Flag

Tom Clancy's Rainbow Six Siege

Watch_Dogs 2

Payday 2