Pick up someones gun and kill them with it
You do not challenge Infinity Ward
Get into a challenge lobby.
challenge lobby
yes
complete challenge "silent veteran II"
You have to get invited by a co-host or a host that hosts challenge lobbies
Do the challenge "Ultimate Sacrifice" which you unlock be nuking the enemy while you are losing
You have to get all of the attachments on the ACR to get the mastery.
Yes, but only when you unlock the challenge Flyswatter
Modern warfare reflex and modern warfare are the same. Modern warfare "reflex" means that its for wii. If its just modern warfare its for the other consoles
complete challenges from the barracks , gennerally the harder the challenge the cooler the title
Challenge: "Counter-C4: I" - Kill 3 enemies by shooting C4.