I was playing E1M9 as normal, and while walking around inside the boundaries of the map, I got the achievement. Has this happened to anyone else?

Yeah. It's the first Dusk achievement I ever got, and I had no idea why either. Same map.

Originally posted by Boksha:

Yeah. It's the first Dusk achievement I ever got, and I had no idea why either. Same map.

Some of the secret triggers are misplaced too it seems. David plz fix absolutely unplayable

I am in a place where it is supposed to trigger and it doesn't.

This happened to me to, on this same map! No idea why it happens; it's probably just a misplaced trigger like FizzyFusion says.

It's still happening today. I already knew how to get it on that specific map, but I still got the achievement without doing it, so I knew right away something was wrong. Just the fact that more than 50% of players got it while other easier secrets are just around 10% really shows it's broken.

Same thing happened to me. Just walking along and then, achievement pop up. I look around, see nothing whatsoever, and then carry on.

Yeah me too, I got the achievement without knowing it had existed until I got it

Same here! (not that i'm complaining )