https://yestino.com/entities/mythic-achievements-c83a79Every event involving Mythic Achievementsenhttps://yestino.com/events/xbox-just-unveiled-mythic-achievements-which-are-basically-p-f48bc8https://yestino.com/events/xbox-just-unveiled-mythic-achievements-which-are-basically-p-f48bc8Tue, 29 Sep 2026 19:05:58 GMTThey signal to the world that someone has fully completed a game. Sources: Engadget