Daredevil is unlocked by finding 5 Daredevil Action Figures scattered around the game. There are more than needed however, so don't freak if you miss one. You can also unlock him by using cheat codes, but I'd prefer the old fashioned way. You can find a list of their locations in the strategy guide or even the internet.
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open game faqs,there is a cheat code in there just follow it
complete new avengers to unlock hulk
there is a add on for it
you can't unlock hulk in the PC version only in the Xbox360 version
you can't cyclops isin't in the psp version of the game