Where's the Mailbox?

Raw Blizzard Data

{
  "_links": {
    "self": {
      "href": "https://us.api.blizzard.com/data/wow/achievement/9911?namespace=static-12.1.0_68914-us"
    }
  },
  "id": 9911,
  "category": {
    "key": {
      "href": "https://us.api.blizzard.com/data/wow/achievement-category/15246?namespace=static-12.1.0_68914-us"
    },
    "name": "Collections",
    "id": 15246
  },
  "name": "Where's the Mailbox?",
  "description": "Collect a Heirloom item.",
  "points": 5,
  "is_account_wide": true,
  "criteria": {
    "id": 43143,
    "description": "Collect 1 Heirloom",
    "amount": 0
  },
  "next_achievement": {
    "key": {
      "href": "https://us.api.blizzard.com/data/wow/achievement/9906?namespace=static-12.1.0_68914-us"
    },
    "name": "Alt-ernative Lifestyle",
    "id": 9906
  },
  "media": {
    "key": {
      "href": "https://us.api.blizzard.com/data/wow/media/achievement/9911?namespace=static-12.1.0_68914-us"
    },
    "id": 9911
  },
  "display_order": 8
}