This Oliphant Has No Brakes
From Halopedia, the Halo wiki
This Oliphant Has No Brakes is an achievement in Halo: The Master Chief Collection. It is unlocked by beating the 90,000 point par score on the level Coastal Highway. 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.
Before the release of Series 3: Recon, players can earn significant points by destroying unoccupied Covenant vehicles as the game did not differentiate between piloted and empty vehicles; this was patched out of Halo 3: ODST on release of the aforementioned season.