Expirations lets you set an expiration date to the GamiPress elements of your choice.
First, you need to know how to add expiration to any element. Expirations is able to work with all GamiPress elements: points (awards and deducts), achievements, ranks and requirements.
Also, here is an explanation of how expirations are displayed at frontend to your users.
Next, there is a guide explaining how expirations work for certain situations, for example, the guide explains what happens if an achievement step has an expiration configured and the user unlocks the achievement before the step expiration date.
In addition, Expirations add-on includes settings to configure emails to be sent before and after an item expiration.