[1.7b3] Spell school unlock achievements

[istur89]

Getting the achievements for locked spell schools like Stone, Storm and Wildfire doesn't actually unlock them, since they're already unlocked by default in beta. F.ex. killing Harkon Zun or Urkis in beta, and then switching back to stable version to play a new character won't have them unlocked for use. This isn't much of an issue in those cases - just kill said bosses in stable version and get the achievements again - but as far as I'm aware cheevos like Pyromancer and Cryomancer that are tracked across multiple characters are one time only (?), so if you happened to get those achievements while playing beta you won't have any way of unlocking Wildfire or Ice schools in stable version. Unless I'm wrong and you can get Pyromancer and Cryomancer multiple times on one account.

Of course, if the plan is for spell schools to be unlocked from the get-go without achievements like they're in the current beta version this won't be much of an issue (eventually), but reporting it nonetheless just in case. Basically an issue that specifically affects beta testers switching back to play the stable version.

[Moasseman]

You can technically get Pyro/Cryo again by playing on a higher difficulty.

And yea, the plan is for the high-elemental trees to be visible by default and not tied to any unlocking conditions