Would you have any preference about how Assassin's Creed is nominated? The modern day storyline (a tiny percentage of each game) is present in all games to an extent so they're technically the same continuity, but there are distinct character sets and time periods in the main storylines (except 2, Brotherhood and Revelations are their own trilogy with the same main character). They get lumped together by AO3 as "Assassin's Creed - All Media Types" (including the comics, books, etc.).