There doesn't seem to be a way to do this. The Achievements tool has a 'validity' setting, but this is an availability/visibility setting really (time limit for users to get the achievement) & doesn't remove the achievement once awarded.
Adaptive release (which I am aware Achievements is built from) is only additive - it would be fantastic if there was a way to remove/hide an achievement after a number of days, to support our use of the platform for compliance (which expires)... A per user timer, triggered upon receipt of an achievement, hiding it after a set number of days.
Adding this to adaptive release functionality would be really useful as well, but adding it to the Achievement tool initially, would make it infinitely more useful for us...
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