Add achievement data

[quae-dev]

Achievement data (at least for Switch/GOG Linux) is stored in shared.dat.

JSON schema:

{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "type": "object",
  "properties": {
    "pairs": {
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "Key": {
            "type": "string"
          },
          "Value": {
            "type": "string",
            "enum": ["0", "1"]
          }
        },
        "required": ["Key", "Value"],
        "additionalProperties": false
      }
    }
  },
  "required": ["pairs"],
  "additionalProperties": false
}