Kill a Legendary Boss in Warzone.

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From the main menu select Multiplayer > Warzone and press A to Open.

Select Warzone or Warzone Firefight from the Playlist and press A to Select.

During a Warzone match, 3 Legendary Bosses will appear. Their position will be shown by a yellow marker. You have to be the one to land the killing blow or do a significant amount of the damage. Using heavy weapons or a vehicle will give you a much better chance of doing a significant amount of damage, or your shot doing enough damage to kill the boss. An alternative approach is to use a weapon with a high rate of fire.

Achievement is worth 30 Gamerscore.