Using a grenade launcher attachment or Thumper, make a direct impact kill on an enemy.
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You have to get invited by a co-host or a host that hosts challenge lobbies
when you unlock the humiliation catagoritory in finishers its the ouch achevement its a direct impact kill with the underslung grenade launcher
kill somebody just before he/she earns an 10 or more killstreak
No he doesn't do a voice in Modern Warfare 2.
There are no golden weapons in Modern Warfare 2.