Achilles Davenport is the Mentor of the Colonial Assassins who trained Connor Kenway in Assassin's Creed III. He is the main antagonist of Assassin's Creed: Rogue who attempted to locate the seismic temples and was opposed by the former Assassin-turned-Templar Shay Cormac.
So basically this is gonna be sorting fictional characters into groups/teams/associations of any sort they were apart of during their respective canon. Make sure to clarify for teams with multiple incarnations in different media which one you're talking about.