Eric Lempel, Director of PlayStation Network Operations at SCEA has previously said that “you’re not going to see Trophies on the PSP,” citing piracy and the ability to upload save games as the main reason. “If people can artificially inflate their rankings and amounts of Trophies it kills the whole [Trophy] system,” he concluded. He’d obviously forgotten the fact that you could upload save games for the PS3 too until they started locking down the save files because of the Trophies, mind.
However, Shu Yoshida, Senior Vice President at Product Development at SCEA doesn’t seem to agree with Lempel, saying PSP Trophies are “under discussion,” although agreeing with his colleague’s view in this month’s Official PlayStation Magazine (US) that “there are some technical challenges.” Nobody from Sony’s said, to my knowledge, whether Trophies on the PS3 have helped attach rate, but surely with Store downloads (and no piracy) there’d be a lot more PSP titles shifted.

I’m split with whether I want this to happen or not, on the one side – trophies on the go! No more being bored on the bus for me
But on the other hand, people have already started to hack ps3 trophies – and the psp is a lot less secure, so it could end up with lots of hacked accounts.