During my interview, they didn't ask that much just have a copy of I-864 and I-485 since that's what they asked me and other required documents listed in the interview notice. Have birth certificate with translation, passport id, social security card and evidence other than call logs and pictures. Like bills, joint bank account, car insurance, health insurance, lease which had both names. That is all they asked me.
I prepared so much but they barely asked of anything. Don't be nervous.