Achievement constructor
- {required String id,
- required String name,
- required String description,
- required int? expReward,
- required int? coinReward,
- required AchievementLevel level,
- required AchievementType type,
- int progression = 0,
- int total = 1}
Implementation
const Achievement({
required this.id,
required this.name,
required this.description,
required this.expReward,
required this.coinReward,
required this.level,
required this.type,
this.progression = 0,
this.total = 1,
});