I'm on medium but in my last attempt, I started with one pill bottle. I just thought I found it somewhere in that level and when I noticed it inthe corner of my screen, I ended up getting blasted and had to use it
If I start fresh knowing I have one, that will make it easier. That headshot achievement seems impossible though. I guess thats why it's called Lucky something.
Love the kill cams especially shotguns at close range. I always pump a few more in to them just to send a message. The bullet time makes you feel like one hell of a bad-ass