The 2 hour refund window is for automated refunds, you can still make a request if you’re past that - it’s just going to need a human to take a look at it. I’ve once succesfully returned a game I’ve played for about 5 hours because it had game-breaking bugs and ran like crap for no reason, and it got accepted within a day without an issue.
So Helldivers owners have a chance. I’m assuming that Steam’s Customer Support department is having some kind of an internal discussion right now on how to handle this case.
Yeah, one of the only games I’ve 100%ed, the achievements are deliberately set up so that you can get most of them organically by the time you get to the true ending. The rarest achievement on Steam has like a 6% obtainment rate, which is a lot.