Actually Achievements are an odd duck. For many players they are indeed of great value. It digs into that whole "collector" mentality.
I mean "gotta catch em all" ala Pokemon.
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Yes, a good middle ground would be "flag" certain mods that would say prevent you from getting Achievements.
I personally could care less about most Achievements, but I do understand WHY there is an obsession with getting them.
Precisely! I recognize the intent to protect the meta-value of achievements. Which was the point of my suggestion, because not all mods affect how easy/hard it is to obtain mods. If anything, they're material to potentially add more achievement opportunities.