Looks like the achievements are just a reflection of your current statistics. That's fine for most of them, but makes retaining some of them problemmatic.
For example, "Currently Watching" will go away if I finish all of the series I am currently watching. (It's also a bit difficult to get that one in the first place, since there's an understandable delay between when a series airs and when a series has enough art to make a tag for it, so some of the series I'm actually currently watching aren't in the database right now.)
Do you guys have plans to adjust the system so that once you earn an achievement, it sticks with you (unless it was earned through bad behavior, like spamming)?