One Down, 51 to Go

From Halopedia, the Halo wiki

One Down, 51 to Go

One Down, 51 to Go is an achievement in Halo: Reach. It was unlocked by completing a Weekly Challenge.[1]

Following the shutdown of Xbox 360 Halo online services on January 13, 2022, this achievement is no longer attainable.[2][3]


The name comes from the number of weeks in the year which is 52. Completing one weekly challenge represents the completion of 1 out of 52 challenges.