Firefight: Lost Platoon
From Halopedia, the Halo wiki
Firefight: Lost Platoon
Firefight: Lost Platoon is an achievement in Halo 3: ODST. It is awarded for scoring over 200,000 points during a match of Firefight on the map Lost Platoon. It is worth 10 Gamerpoints.[1]
This is probably the easiest Firefight achievement, as all you have to do is highjack a Chopper early in the game and score kills until you get 200,000 points. It is done best on Normal difficulty.
When doing this on single player, allow a minimum of 2 hours to reach the 200,000 points.
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