On a Massive Number of Missions

Raw Blizzard Data

{
  "_links": {
    "self": {
      "href": "https://us.api.blizzard.com/data/wow/achievement/9139?namespace=static-12.1.0_68914-us"
    }
  },
  "id": 9139,
  "category": {
    "key": {
      "href": "https://us.api.blizzard.com/data/wow/achievement-category/15303?namespace=static-12.1.0_68914-us"
    },
    "name": "Draenor Garrison",
    "id": 15303
  },
  "name": "On a Massive Number of Missions",
  "description": "Complete 500 garrison missions.",
  "points": 5,
  "is_account_wide": true,
  "criteria": {
    "id": 37713,
    "description": "Complete 500 Garrison Missions.",
    "amount": 0,
    "operator": {
      "type": "AND",
      "name": "Complete All"
    },
    "child_criteria": [
      {
        "id": 37714,
        "description": "Complete 500 garrison missions.",
        "amount": 500,
        "show_progress_bar": true
      }
    ]
  },
  "prerequisite_achievement": {
    "key": {
      "href": "https://us.api.blizzard.com/data/wow/achievement/9138?namespace=static-12.1.0_68914-us"
    },
    "name": "On a Lot of Missions",
    "id": 9138
  },
  "next_achievement": {
    "key": {
      "href": "https://us.api.blizzard.com/data/wow/achievement/9140?namespace=static-12.1.0_68914-us"
    },
    "name": "On a Metric Ton of Missions",
    "id": 9140
  },
  "media": {
    "key": {
      "href": "https://us.api.blizzard.com/data/wow/media/achievement/9139?namespace=static-12.1.0_68914-us"
    },
    "id": 9139
  },
  "display_order": 108
}