Well seeing as people with $2000 rigs are not able to run it smoothly due to the game being trash, then no you can't run it. Assassins creed unity is one of the worst PC games of all time. If you read some reviews on it from steam you will see no one can play the game smoothly with anything from an i5 and gtx 780 to an overclocked six core i7 with crossfire r9 290x.
Don't buy the game, at least not yet, no matter what your PC is. But given your specs definitely don't buy it.
Sorry for the rant but I liked the assassins creed games and now I can't even play the game with decent fps with my rig... Just shows how terrible ubisoft really is