The rewards as they're represented in the UI. Note that they generally link to " dummy" items that give a summary of rewards rather than direct, real items themselves.
If the quantity is 0, don't show the quantity.
The hash for the Objective that matches this challenge. Use it to look up the DestinyObjectiveDefinition.
Mapped to DestinyObjectiveDefinition in the manifest.
Represents a reference to a Challenge, which for now is just an Objective.