Overcharge your plasma pistol at a covenant vehicle that you wish to take and shoot the vehicle. This will stun the vehicle but not destroy it. You must then quickly get rid of the driver. Done you will have unlocked the stunned achievement.
digg_url = ‘http://xbox360glitches.com/2009/10/halo-3-odst-achievement-stunned/’;
digg_title = ‘Halo 3 ODST Achievement Stunned’;
digg_bodytext = ‘
Overcharge your plasma [...]
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