Like in subject: Can you group DLC achievements by actual DLC required? As of Jan 2nd 2024 there are 2 ambiguous packs named "Unknown Pack".
The required DLC can be simply pinpointed and it is one of the following:
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Pinball FX - A Charlie Brown Christmas™ Pinball-
Pinball FX - Star Trek™ Pinball-
Pinball FX - Game Night Pinball Volume 1-
Pinball FX - Charity Pack