There are always going to be those basic unlockables that you can get. inFamous is no different, so here are the basic ones that you'll gain in the game:
AC/DC: Manage to drain off over 750 megawatts from Empire City's power supply.
Doctor Cole: Heal over 250 pedestrians on your travels through the city.
Drop Everything: Do a Thunder Drop that is at least 500 meters in distance.
Electric Hobo: Stay on the train for over 2 kilometers in any area of the game.
Evil Eats: Don't share any food with anyone that really needs it.
Evil Finish or Evil Silver Finish: simply finish the game while inFamous.
Evil Riot: When you're being bad, start yourself up a good 'ole riot!
Evil Train: Make sure that everyone on the train knows just who the boss is and that the train isn't going anywhere you don't want it to!
Frequent Flyer: Go over 5 kilometers using your Static Thrusters in the game in any district.
Good Eats: Feed tons of needy people in the game. I'm actually not sure how many, sometimes it's 10, sometimes it's 50. Just do it when you can.
Good Finish or Silver Finish: simply finish the game as a Hero.
Good Riot: When you're being good, stand up and take the heat from a needy person.
Good Train: Help to find solutions to problems with the train to get it going again.
Hard Finish or Gold Finish: simply finish the story mode completely on hard mode.
inFamous Platinum unlockable: simply gather up all of the trophies in the game.
With all of the different territories in inFamous, there are bound to be some unlockables when you discover them right? Here are the cool unlockables that you'll gain by discovering and beating different areas of the game.
Civic Leader Silver: Simply control all of the area in the Warren area of the game.
Community Organizer Silver: Simply control all of the territory in the Neon District of the game.
Hotfoot: Go over 25 kilometers while you are on the rails in any area of the game.
Urban Designer Silver: Simply control all of the territory in the Historic District area of the game.