Q:
Do I still have time to get the gas mask?
A:
Most people have said that it is moving at a near-constant rate. ~25% after 1 week, ~50% after 2 weeks, and now its ~75% after 3 weeks. If that’s truly player interaction based on farmers or achievement hunters lead there by the daily, or if it’s automated who knows.
But hoc, assume you have about a week to finish up. If you are able to do the daily meta each day and work on the other ones you should be fine. You can look up a map for all of the chamber locations (they don’t need to be active to count for the achievement), killing the hybrid 5? times solo will not take very long (maybe 10-15 min per run and now it gives a key piece per run). I don’t remember the other ones off the top of my head, but you should be time if you focus on it.
The Tower only closes up once the “Antitoxin Injected” bar reaches full. Its still got a fair bit to go (it seems to move a few pixels every day at most), so you ought to have plenty of time.
Thanks a bunch for the answers guys! I’ll try to focus on on doing the living world achievements and see how it goes.