For completing a chapter without dying I believe your save file has to have 0 deaths. Just make a new save on a usb to do it.
Also someone asked what hybrid rush is. Each level gives you a random bob to use. You are on a timer that continues to count down through each level. You get more time by getting all the gems on a level. You lose when your time runs out.
Also a tip for getting high scores in escalation. Save up your gems til around level 50-60 then start using slow motion every level. The key is to keep your multiplier as high as possoble. This will make 1.5 million easy to get with some of the bobs.