[2021] Help with achievement?

Hi! Sorry for the trouble, this is an actual bug and there's probably no easy way to work around it for the moment: currently, you need to descend the height of the level + 5000 meters, which probably isn't possible without modifying the levels because the sea floor is above that depth.

We'll fix it as soon as we're able to, and you can keep tabs on it via this GitHub ticket if you'd like to: https://github.com/Regalis11/Barotrauma/issues/4702