Like most Assassin's Creed games, Black Flag takes a decent amount of time to complete and had quite a few collectibles that must be found before earning its platinum. It also has a handful of multiplayer trophies, including one that requires the player to reach level 55 in multiplayer. While this takes several hours, it can actually be done solo by playing the game's "Wolfpack" mode in a private lobby, making this a mostly-offline platinum.