User blog comment:Spazzacamino/Challenge's Stuck!!!/@comment-68.189.163.212-20100629004027

It definitely isn't the bounty missions you are missing. The previous poster is correct. 8 New Austin, 8 Mexico, and 8 West Elizabeth (Blackwater). Some possible things you missed are - Have you purchased all of the "rare" weapons? Do you have at least one winning session in each mini-game? 19 stranger missions? (For some reason the "I Know You" mission doesn't count for the required 18.)