Assassin's Creed III Remastered

After you ruin Captain Dominguez's operation in the main story Crew Three Crew missions will appear. One mission is a minute long "race" where you have to get from checkpoint to checkpoint. It can be challenging but once you are familiar with where you have to go it's not too bad. Once all three mission are finished the achievement will pop. The mission constraints do not effect the 100% achievement.