This is Not Your Grave…

 (named This is Not Your Grave in Halo: The Master Chief Collection) is an achievement in Halo: Reach and Halo: The Master Chief Collection. It is awarded for completing the level The Package on Normal difficulty or higher. It is worth 10 Gamerpoints.

Trivia
The name is a reference to a quote made by the Gravemind in Halo 2: "This is not your grave...but you are welcome in it."