Have you wondered what has to be done so you can click on the "Rewind" button?
Well, it's easy when you know it - you need to collect 1 Billion VHS.
It doesn't matter how you get to 1B VHS. What I mean is - you don't need for example the calculator to be Lv. 5 and the computer Lv. 15. You just have to reach 1B.
This goes for all Rewind Achievements