There's an award I have called the 'Friendly Fire Award' that is no longer obtainable. It used to be legitimately obtainable by dealing significant damage to allied teammates with AOE weapons. Ofcouse, the easiest way to get this award was nuking your allied team. This was not considered very cash-money of people, so the game no longer tracks and gives out the award.
For the record, I got my friendly fire award due to a descynced game.