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In beating Infamous 2, I believe what you have done is made it so the game put you right before you beat the game with everything unlocked. From what I remember there is also an option to restart the game over from the very beginning. The only way to complete both endings fully is by replaying the game both ways. You can't beat the game once and then not go through most of the game a second time.
it puts you right before the end of the game so if you missed anything (like shards) you can go back and collect them all or do whatever you missed.
When you start a new game you just do the evil ways since you already did the good. Both inFamous games are worth playing twice to see both endings.
I always did good first being all careful and stuff, that way on my second play thru i could just go buck wild being evil