Neither of the mana related achievements unlock on the xbox.

Sorcerer Gadget (spend 50k mana on crafting): I've crafted artifacts that cost 70k and it still hasn't unlocked.

Mana Millionaire (spend 50k mana on casting): I've summoned 50 sky drakes in a row and it also hasn't unlocked.

So the requirement either isn't 50k mana or it's not being tracked correctly.

Based on the inactivity of this forum I doubt we'll see a patch, but I figured I'll take a chance to post this message on the off chance that someone is actually monitoring these.