So before I begin this, there will be some spoilers. I wish to explain accurately and with detail. This is based on chronological time periods and when they line up.
So starting we have Assassins creed Odyssey. This story line follows the eagle bearer. Aka the one to give birth to one of the future first assassins. This game takes places 431 BC - 404 BC. Next we travel into ancient Egypt. Assassins creed Origins. This takes place between 49-43 BC. Where the creed actually begins.
Next we have Assassins Creed Mirage which is ate in the 9th century. This ties into assassins creed Valhalla which Basim is the assassin in Mirage and Valhalla.
Moving onto Assassins creed 1 and Assassins Creed Revelations. Assassins creed 1 runs through the life of Altaïr. Now Assassins creed revelations connects to AC 1. Which is why I suggest to play it after. Which important mentions there’s AC Altaïr chronicles and Bloodlines. I do not know much about those but those might be worth checking out before Revelations.
Before our next assassins creed go watch Assassins Creed Linage based I’d guess around 1475
Then we move onto Assassins creed 2 and Brotherhood. Which explores the life of Ezio Auditore. Which is based 1476- 1507
There’s two small games after these, AC Rebellion (1517 AD) and Chronicles China ( 1526-1532 AD)
Assassins creed Black Flag, 1715-1722 AD. Which this ties into Unity and Syndicate but I’ll get into that later.
Then there’s two side games which one (Assassins Creed Pirates) never heard of it so probably not important but Assassins Creed Freedom cry I’d say is important to play. 1735- 1737. I can’t remember fully but I believe that this assassin is Edward’s highest friend I forget his name 😅.
Play Assassins Creed Rogue next, 1752- 1776 AD. This ties into our next two games. Assassins Creed 3 and Unity.
Which after play AC3 which is based 1754-1783. Then play Assassins Creed Unity 1776-1800 ad. Assassins Creed Chronicles: India ( 1841 AD ) this is a side game that you don’t have to play but may.
Finally we have Assassins Creed syndicate ( 1868 AD ) and Assassins Creed: Chronicles Russia (1918 AD) (Side Game). Which afterwards I suggest watch the AC movie and read some books.
Now connection page.
In AC Revelations it explores Ezio falling in love while he figures out things about the past with Altaïr.
Assassins Creed Black Flag ties into Unity and Syndicate. As Edward appears in a cutscene in Unity. While in Syndicate you actually explore Edward’s house.
Then Assassins Creed Rogue is important to play because you meet Conor’s father and you meet the person or play as the person (I forget) who kills Arno’s father in the first cutscene.