Now my fellow assassin you will get to learn and know about the downloadable content or DLC as it is known now with technology. This page will go through each games DLC's and what was contained within them.

Assassins Creed Odyssey DLC's: The first blade it is basically an add on to the story of assassins creed odyssey and how the first hidden blade was created.
The Fate of Atlantis: You travel to its sunken ruins and discover what had lead this once great city to the now underwater fate.
Assassins Creed 3 Remastered: It's the remastered editon of AC3

Assassins Creed Origins DLC's: The Hidden Ones, It is a continuation of the story itself and goes on to show how the first original assassins creed was created all the way back in ancient eygpt.
Curse of the pharaohs, An extension of the story where you travel to another sie of the game where you get to travel to the underworld known as the fields of reeds and take down each of the cursed pharohs including King Tutankhamun(Who is a pain to beat in the game if you are not level 50)

Assassins Creed II DLC's: Batttle of Forlì, You get to fly around on Lenanardo Da Vinci's flying machine around the city of Forlì and it also contained extra memory sequences for the player to do.
Bonfire of the Vanities: You travel back to Florence after the main story and discover that it has been taken over by Savonarola and his nine lieutenants. So you assassinate all of them and reclaim back the city.


Assassins Creed Unity: Dead Kings, An extension slightly of the story where you go with tomb raiders to a temple and finally discover another piece of precursor/Eden other than the sword from the main story line all the while Arno is still upset at his templar girlfriends death.

Assassins Creed Sydnicate: Jack The Ripper, An extension of the story it is set 20 years after the game itself and it is about what happens and where you have to find Jacob as Evie.