Halo: Reach - A Spoonfull of Blamite Achievement

Killed 10 enemies in Firefight or Campaign with a supercombine explosion.

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This must be done on Normal Difficulty, or Harder.

If you die, the previous kills you got will not count.

This can be done in any game mode. A supercombine explosion is when you put so many needles into a enemy, the needles explode and cause instant death.
This can be done with two different weapons, the Needler, and the Needler Rifle. All you need to do is find one or the other, and get the 10 kills.

Needle Kill Medal:
If you get a kill that is caused by a supercombine, you will see this medal appear on your screen. This only shows up in:

Campaign (Only when scoring is turned on for Campaign)
Firefight
Matchmaking/Multiplayer
Custom Games