you must find all the one scattered all around and you must win them by doing extra side missions.
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There is no easy way just look around for them while doing missions :)
i unlocked one once , you need to get lots of precursor orbs
There isn't,that's just the title for Jak 2 in Europe.
Jak and Daxter the Precursor Legacy. Daxter. Daxter 2. Jak 2 Renegade. Jak 3. Jak X combat racing. Jak and Daxter the Lost Frontier.
YOU CANT you have to find them the only way is to hack into the game which is what cheating devices do sorry how unfortunate i would be doing it right now if you didnt have to use a cheating device :(