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LASO Master

From Halopedia, the Halo wiki

LASO Master is an achievement in Halo: The Master Chief Collection. It is worth 50 gamerscore. To unlock this achievement, the player has to complete the LASO playlists for Halo: Combat Evolved Anniversary, Halo 2: Anniversary, Halo 3, and Halo 4. The LASO playlists for Halo 3: ODST and Halo: Reach are not required.