[1.0] Additional Filter

[Papagelos2]

When searching for achivements to do, the filter option have YOURS, ALL ACHIEVED and EVERYTHING.

The missing option here is UNCOMPLETED so one gets a list of things left to do.
Without it, it's really messy to get an overview. Might also want to have a switch for
what difficulty to display achievements to clean up a bit of the mess.

I'd give the achivement improvments a decently high priority, considering how popular
achivements are and how many extra months/years they can make people stick to a game to
complete them, increasing game longivety a lot with a relatively small amount of coding work.

[eddparsons]

Seconded, that would be useful.

[Crim, The Red Thunder]

Or just sort achievements by difficulty in the first place, so you only see achievements for your current difficulty at all. Allowing achievements to be independent of difficulty for adventure/roguelike/exploration might be nice too. Kinda annoying that only those who play roguelike get achievements for nightmare/insane. Just give each difficulty a list, and then a adventure/explore/roguelike version for each achievement on each difficulties list. Could allow the higher difficulties to be more accessible to those who might not be ready to attempt roguelike. (And of course, a filter option to only show your current death mode, so avoid mess)

Seconded (well, third'ed) for a 'not done yet', though it might get messy still since some conflict with each other, and saying that 'this one is available' could potentially spoil what/where some achievements are.