Too Close to the Sun
From Halopedia, the Halo wiki
Is a Halo 3 multiplayer achievement. It is awarded for destroying a Banshee in either campaign or a ranked multiplayer playlist with a Spartan Laser or Missile Pod. Unlocking this achievement will give you the Scout Body for Spartan Armor Customization.
An easy spot to complete this achievement is near the start of The Covenant (Level), after the first batch of brutes and grunts. Banshees occupy the airspace there, and Master Chief spawns with a Spartan Laser.