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Countdown

From Halopedia, the Halo wiki

This article is about the Halo 4 achievement. For the Halo: Reach multiplayer map, see Countdown.

Countdown is an achievement in Halo: The Master Chief Collection. It is unlocked by beating the 25 minute par time on the level Midnight. The achievement is worth 10 Gamerscore and can be unlocked on any difficulty.