No, I didn't 100% L4D. I tried for hours upon hours to get the achievement for letting nobody be hurt by a special infected, but never got it. I've been stuck on 960 or 970 for years.
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Xbox GT/PSN name: TatteredUniform - SSBB FC: 1891-0831-5747 (TEETS)
http://card.mygamercard.net/nxe/TatteredUniform.png