[
  {
    "id": "achievement_mutation_threshold_dragon_black",
    "type": "achievement",
    "name": "Dragons don't have nightmares, nightmares have dragons!",
    "requirements": [
      {
        "event_statistic": "avatar_last_crosses_mutation_threshold",
        "is": "==",
        "target": [ "mutation_category_id", "DRAGON_BLACK" ],
        "description": "crossed black dragon mutation threshold",
        "visible": "when_achievement_completed"
      }
    ]
  }
]
