Back At It

From Halopedia, the Halo wiki

Back At It is an achievement in Halo: The Master Chief Collection. It is unlocked by playing Halo 2 on the 9th of any month - the day in November, 2004 when the original game was released. The achievement will unlock as soon as the player begins a campaign mission or multiplayer match. The achievement is worth 5 Gamerscore, and the Xbox achievement art is a still of John-117 and Avery Johnson walking to the ceremony from the Halo 2: Anniversary opening cutscene from Cairo Station.