To get the ...And Stay Dead achievement in Little Nightmares 2 you need to continuously hit the hand that attacks you whilst trying to retrieve the fuse during chapter 3 (the hospital chapter). The easiest way to defeat the hand is to try to swing for it just when it gets close enough, it will jump away from you, just swing again immediately after you miss and your hit should connect. Here is my own video guide that shows how to get the ...And Stay Dead achievement. The guide for this achievement is shown at around the 14:26 mark.