The achievements with the IDs 13138 and 13196 are returning an icon asset URL that is not working.
E.g. the following API call
https://eu.api.blizzard.com/data/wow/media/achievement/13138?namespace=static-8.2.0_30827-eu
returns
"assets": [
{
"key": "icon",
"value": "https://render-eu.worldofwarcraft.com/icons/56/inv_8xp_encrypted01.jpg"
}
]
But this URL is only returning a 403. Can you verify that? Is there a wrong URL returned from the API or is the icon not uploaded on the server?