I'm currently in the process of unlocking the "Go outside" achievement in The Stanley Parable (in other words, I haven't touched the game in quite a while). I'm aware there are ways to unlock this achievement by changing the system time settings, but I'd rather unlock it the legitimate way.
However, I'm about to get a new computer and I'm not sure if I'll be able to keep my "progress". Normally I'd assume the game stores a timestamp of my last play session in a cloud save, but since the system time appears to be involved, I'm not so sure. I'm afraid that if I launch the game on my new machine, it will think I've never played it before, even if five years have passed in reality.
Do I have to start the game on the same computer after five years to get the achievement, or will Steam keep track of the timespan for me?