Considering my immortal run on hard had less than 50 damage total through the entire game and I let some of the supercharges sidetrack me, yeah, it's still possible. Heck, if you're dedicated 0 is technically possible. But I'd recommend redoing sector 7 anyways, because you don't wanna use up a quarter of your quota in one level (obviously you don't have as much mastery over the AI as me so you aren't
Trying to get all posters (and ribbons, but they're always possible) and total pacifism on one run without reboot sounds tricky logistically. Lets see, requirements:
Level 1: One point spent on str
Level 2: I actually forget where this poster is
Level 3: Break pacifism because you'll have to kill Krotera, so restart
Level 4: Almost, almost impossible without breaking pacifism. Also, unless you're willing to kill someone off their bike I think it requires the same choice of rocket jump or points in strength that the supercharge required
Level 5: Actually, this doesn't require any specific skills IIRC, but if you do it as a pacifist you're gonna need a lot of health.
Level 6: Requires ten Tasen, ten Komato and ten Crack. Definitely the bottleneck, that's 27 skill points. Plus side, the supercharge will be free.
Level 7: Requires the hyper pulse weapon. I think there's no strength requirement.
Level 8: Requires a rocket jump, I believe.
Level 9: Requires a devastator (already have) and either maxed health or near-maxed health. Though I assume you're on easy, so the health requirement's not nearly as severe because the pickups along the way affect you double.
Level 10: Ah yes. The poster and the pacifism are both yours if you've got all weapons.
Course, even with all this, you'll still have to pass up the Scrambler, which can only be gotten by killing its owner. You'll get the banana gun for free though.