The event is not cancelable.

The event does not have a result.

It might be required for you to import the package if you encounter any issues (like casting an Array), so better be safe than sorry and add the import at the very top of the file.

ZenScript
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import crafttweaker.forge.api.event.advancement.AdvancementProgressEvent;

AdvancementProgressEvent extends PlayerEvent. That means all methods available in PlayerEvent are also available in AdvancementProgressEvent

Name	Type	Has Getter	Has Setter
Name advancement	Type Advancement	Has Getter true	Has Setter false
Name advancementProgress	Type AdvancementProgress	Has Getter true	Has Setter false
Name criterionName	Type string	Has Getter true	Has Setter false
Name progressType	Type AdvancementProgressEventType	Has Getter true	Has Setter false