curl --request GET \
  --url https://{subdomain}.nudj.cx/api/v2/analytics/achievements/stats/overview

{
  "summary": {
    "totalParticipants": 123,
    "totalCompletions": 123,
    "completionRate": 123,
    "averageTimeToCompleteHours": 123,
    "startedNotCompleted": 123,
    "totalClaimed": 123
  },
  "criteriaCompletionRates": [
    {
      "criteriaId": "<string>",
      "criteriaAlias": "<string>",
      "completionRate": 123,
      "totalCompletions": 123
    }
  ],
  "timeseries": [
    {
      "date": "2023-11-07T05:31:56Z",
      "value": 0,
      "started": 0,
      "completed": 0,
      "claimed": 0
    }
  ]
}