Hello dear people of the fog!
Yesterday I saw something that really caught my attention, there was a guy who had all his achievements done this month, many of them with the same date and time, like the "adept" ones. I was sure he was using someone else's save file, because he only had around 60 achievements and all P3 survivors/killers, but when I went to his screenshots I saw many of them dating on 11/2017, and that's when things got a little confusing for me. If he started to play at least 6 months ago, how can his first achievement be on this month? I asked him that and the answer was "my game is bugged". Can a bug actually mess up the achievements or did he use an illegal tool to erase it?

Thanks!