First out in my dip into this Arcade game is an achievement guide for:
The way you treated Innocence forged his character. How would have he turned out without you?
You will usually get three responses to choose from, and for the most part. A good, a bad, and a neutral response. Seldom do they mix it up a little bit and give you only two responses, or two neutral. Note that this will contain some spoilers.
Opening sequence, right after the intro
Good: I couldn’t just stand there and do nothing
Good: It’s nothing. Let’s get out of here.
After beating up Fatso
Good: Let’s go to the Mess Hall. We need to talk.
Mess hall first conversation
Good: Yeah, but it’s not going to be easy.
Good: Want me to go with you to recruitment?
Optional conversation in Camp 19 (Talk with Innocence, Y, after the Mess scene)
“Where do you come from?” Good: Nothing exeptional.
“What battles did you fight in?” Good: I kept my head down.
After you come back up from the Mole Caves and go to the Mess again
Good: That’ll do. You’re coming with me now.
When asking Jey about the picture during the Another Face side quest.
Good: Don’t worry.I’ll be there.
Talking with Innocence after opening scene.
“You know Shadowlair Well?” Good: I’ll have to show you the slums.
After you reach Innocence's parents shop for the scene, talk to him again.
“You said your parents were in the militia?” Good: A noble intention…
Talk to Innocence again right after the above.
“You holding up?” Good: “You know you can count on me.”
There are plenty other conversations, but they don't lead to you making a response. After the above, you have influenced him as much as you can do, and the achievement will unlock when Chapter 2 ends by you picking a side.