I don't believe it was changed from 45%. I got the 50% Corrupt/Hallow achievements back before 1.2 hit when the console version just came out. Unless you aren't talking about Console and I'm somehow confused?
When I did this (this was before the Clentaminator existed, and the Hamdrax was the best drill/pickaxe in the game) I mined out massive amounts of Jungle. Additionally, I started "layering" dirt in several thousand block long rows of 1, and then planted grass on it so that it could turn into tens of thousands of corrupt grass, which counts I believe.
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