There is up to 4 player co-op in AC Unity. You can join together with your friends and complete "Brotherhood" missions. The story missions do not support co-op. Very similar the Watch Dogs is that ...

In a press release sent by Ubisoft, reveals and confirms that Assassin’s Creed: Unity will feature four-player online co-op missions that are story-driven. In addition to the sprawling single-player ...

The producer on Assassin’s Creed Unity has revealed that Ubisoft had previously planned on introducing co-op for the pseudo-historical adventure franchise as far back as 2009’s Assassin’s Creed II.