From Halopedia, the Halo wiki
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Déjà Vu is an achievement in Halo: The Master Chief Collection. This achievement is obtained when a player completes Coastal Highway on 4-player Legendary co-op with the Iron skull active and without using the Warthog or Scorpion. It is The Master Chief Collection's equivalent of Vidmaster Challenge: Deja Vu from the original Halo 3: ODST.