This is Not Your Grave...
This is Not Your Grave... is an achievement in Halo: Reach. It is awarded for completing the level The Package on Normal difficulty or higher.[1] 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." [2]
Sources