Downloaded the game on another PC, ran it and it crashed on the first try. The second time it ran fine. Might not be useful, but the details are below.

0.001 2017-12-31 16:17:05; Factorio 0.15.40 (build 30950, win64, steam)
0.002 Operating system: Windows 7 Service Pack 1
0.002 Program arguments ...

Could you at least make the achievements not unlock on first run of the game for all users? Anyway, I understand the reasoning.

Thanks for the fast response! The first is the case, I had the same Windows account and different Steam accounts.

Most games that Steam synchronizes have had per-user settings, saves and achievements, but that's not the case for Factorio. I'd understand if that's a design choice, then I'd assume ...

Thanks for the workaround, but it doesn't fix the bug. I mainly noted this because people got annoyed that they had the achievements unlocked without first doing anything for them in the game when I showed it to them.

The workaround means I'll have to do this on every computer that uses the Steam ...

Not sure if this is a bug or a feature or whether it's been posted before, but every user on the same computer shares save games and achievements. Even when logged into different Steam accounts. Worse still, any achievements another user has, automatically unlocks those same achievements under ...