We're in for Some Chop
From Halopedia, the Halo wiki
We're in for some Chop is a Halo 3 multiplayer achievement. It is awarded for destroying an enemy vehicle with equipment (e.g. a Trip Mine) in a ranked playlist or in campaign(Use a tank on the level Covenant with the tank, if you are lucky to get three or more Brutes in a Prowler).
It is represented by a yellow eight-pointed star on top of a red eight-pointed star. On top of this is a red circle with a white dash across it.
This achievement is impossible to get in a ranked playlist with a mine since it doesn't spawn in any map naturally except Sandtrap which is a Social Playlist. Its name is a reference to a line from the movie Aliens.
One way to get this achievement is to go to Tsavo Highway, disable a Brute Chopper (when there is a Brute in it) with a plasma pistol, throw a trip mine at it, and fire another overcharged shot at the Chopper. It will not move in time to get away from the trip mine's explosion. It can be done on the Easy difficulty and it doesn't have to be a Trip Mine. Another way to get it is use the power drainer on a Grunt inside a Ghost.
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