Sony has filed a patent application with the following.
A method and apparatus for adding trophy support [to] games that do not have trophies without modifying the original game. The method and apparatus are used to detect particular disk access, use the detected disk access as potential trophy triggers in games, and recognize the triggers while a game is played. Trophies are awarded based on the triggers, and the awarded trophies are stored.
God Bless and Play Hard Gamers!