Mark an achievement as completed

curl --request POST \
  --url https://app.trophy.so/api/achievements/{key}/complete \
  --header 'Content-Type: application/json' \
  --header 'X-API-KEY: <api-key>' \
  --data '{
  "user": {
    "title": "User",
    "type": "object",
    "description": "A user of your application.",
    "allOf": [
      {
        "title": "Upserted User",
        "type": "object",
        "description": "An object with editable user fields.",
        "allOf": [
          {
            "title": "Updated User",
            "type": "object",
            "description": "An object with editable user fields.",
            "properties": {
              "email": {
                "type": "string",
                "description": "The user'\''s email address. Required if subscribeToEmails is true.",
                "example": "user@example.com"
              },
              "name": {
                "type": "string",
                "description": "The name to refer to the user by in emails.",
                "example": "User"
              },
              "tz": {
                "type": "string",
                "description": "The user'\''s timezone (used for email scheduling).",
                "example": "Europe/London"
              },
              "subscribeToEmails": {
                "type": "boolean",
                "default": true,
                "description": "Whether the user should receive Trophy-powered emails. Cannot be false if an email is provided.",
                "example": true
              }
            }
          },
          {
            "type": "object",
            "properties": {
              "id": {
                "type": "string",
                "description": "The ID of the user in your database. Must be a string.",
                "example": "user-id"
              }
            },
            "required": [
              "id"
            ]
          }
        ]
      },
      {
        "type": "object",
        "properties": {
          "control": {
            "type": "boolean",
            "description": "Whether the user is in the control group, meaning they do not receive emails or other communications from Trophy.",
            "example": false
          },
          "created": {
            "type": "string",
            "format": "date-time",
            "description": "The date and time the user was created, in ISO 8601 format.",
            "example": "2021-01-01T00:00:00Z"
          },
          "updated": {
            "type": "string",
            "format": "date-time",
            "description": "The date and time the user was last updated, in ISO 8601 format.",
            "example": "2021-01-01T00:00:00Z"
          }
        }
      }
    ]
  }
}'

{
  "completionId": "0040fe51-6bce-4b44-b0ad-bddc4e123534",
  "achievement": {
    "id": "5100fe51-6bce-6j44-b0hs-bddc4e123682",
    "trigger": "api",
    "name": "Finish onboarding",
    "description": "Complete the onboarding process.",
    "badgeUrl": "https://example.com/badge.png",
    "key": "finish-onboarding",
    "achievedAt": "2021-01-01T00:00:00Z"
  }
}