In "Call Of Duty: Zombies", completing which map's easter egg will reward you with the achievement, "Time Travel Will Tell"?

The answer is Shangri-La because completing the Easter Egg on this specific map in Call of Duty Zombies will reward players with the achievement "Time Travel Will Tell." Shangri-La is known for its complex Easter Egg quest, requiring players to traverse through different areas, solve puzzles, and defeat various bosses, ultimately leading to the completion of the Easter Egg and unlocking the mentioned achievement.