This achievement is unlocked by putting 32 points into the stat bar of a single mastery. I'd recommend playing a warrior type class like Warfare or Defense because you won't have to rely on spells and abilities as often to carry you through the game. The earliest this can be obtained is at level 13 which would require you to put every ability point thus far (you earn 3 per level excluding level 1)
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-Tyzirkle