Objective Secured
From Halopedia, the Halo wiki
Objective Secured
Objective Secured is an achievement in Halo: The Master Chief Collection. It is unlocked by beating the 8,000 point par score on the level Outskirts. The achievement is worth 10 Gamerscore. Though it can theoretically be unlocked on any difficulty, more points are awarded in campaign scoring when playing on higher difficulties.