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I think the N-grenade might count, which would be 33 total. Simply go into the Combat Simulator and create a match with one Meatsim and whatever guns you might be missing. The first time you get a kill with a given gun, you should see "Saving..." at the bottom left of the screen.
Wrap your troubles in dreams XBL Gamertag: Wolf 11x
Yeah, the n-grenade is in the single player campaign. I just saw it yesterday when I cycled through my weapons at one point. I think it was in Pelagic II, although I don't remember for sure. It was one of the mid to later missions in the game...