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.api.advancement.Advancement;

Advancement extends Record. That means all methods available in Record are also available in Advancement

Name	Type	Has Getter	Has Setter
Name criteria	Type Criterion[string]	Has Getter true	Has Setter false
Name display	Type DisplayInfo?	Has Getter true	Has Setter false
Name isRoot	Type boolean	Has Getter true	Has Setter false
Name name	Type Component?	Has Getter true	Has Setter false
Name parent	Type ResourceLocation?	Has Getter true	Has Setter false
Name requirements	Type AdvancementRequirements	Has Getter true	Has Setter false
Name rewards	Type AdvancementRewards	Has Getter true	Has Setter false
Name sendsTelemetryEvent	Type boolean	Has Getter true	Has Setter false