217685, You get the master titles for unlocking all the attachments Posted by cp900, Tue Jan-05-10 11:06 AM
The hardest one is getting 40 bullet penetration kills for extended mags.
You get a bronze one the first time through. Then once you prestige, getting 500 kills gets you another title with the gun name in silver. I imagine there are more once you go up the levels of prestige, but I am only on the 2nd one.
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