You successfully performed a lethal throw

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This can be obtained in any mission beyond the prologue (cannot be obtained in Personal Contract mission). Pick up an axe or a knife (or anything that is a sharp throwing weapon). Hold 'LT' and aim for the head of the enemy. As long as it's red, press 'RT' to throw it. If successful, the object will kill the enemy. The earliest you can get this is in Mission 2: The King of Chinatown. There are knives near the chefs. You can pick one up and use it to gain the achievement, then reload if you wish.

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