Why complete side missions on first playthrough?

[Frenkovic]

Question:

Why would I complete all side missions on my first playthrough? I know I have to do them in NG+ so I'll get all the side mission and 100% trophies in that playthrough. Is there any reason to do them on my first?

I'm done with my first playthrough and i'm collecting the riddles. Guess I'm starting NG+ when i'm done with that.

[DP21]

Because if u wanna get Perfect knight day 2 trophy u have to do it on both playthroughs. Ng+ and Normal playthrough isn´t the same.

[dda1996a]

To get a 100% on the game you need to do side missions on both. But i recommend collecting all riddler trophies on regular game, because then all riddlers missions are available right after eac other