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And they could just remove any "cheaters" ability to win achievements, which is plenty feasible since 1) they already do that for in-game cheats, and 2) they are able to detect this game-modifying programs somehow, or else these people wouldn't be banned.
It don't think it is fair to assume that their system is already set up to determine the exact nature of the third party hacks being preformed on their game. Blizzard would have to go to an extra effort to tweak their security protocols in order to accommodate people using single player hacks. In essence they would have to spend money to subsidize peoples ability to cheat on their achievements, which they frown upon in the first place.