Close voters: Why do reputation drops not highlight the Achievements icon? does not address the question "When are negative counts in the achievement dialog supposed to be shown in the top row? They are shown sometimes, but not always."
Negative counts aren't shown in the achievement dialog's top row:
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Update: sometimes, negative counts are shown in the achievement dialog's top row:
so the behavior seems inconsistent.
When are negative counts in the achievement dialog supposed to be shown in the top row?
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on the top row, to still reflect the activity, to be consistent to what is done in the reputation tab on a user's profile. No strong preference though.