How to query for Achievement data using the XBox API

Hello! After being asking on the Microsoft Learn forum and the Microsoft Community forum I am now here (where they directed me), seeking for some help with the XBox API. My company is trying to use the API for their web app where we would ingest Achievement data to track player progress and award them with various rewards based on the achievements they received.

I've been trying to use the available documentation for the REST API, but that doesn't contain the expected information. Based on the documentation, the achievement format I should receive should be V2 as described but that wasn't the case.The information that we most importantly would need is the image of the achievement as well as the image of the title the achievement is part of.

I saw there is information about the title id an achievement is connected to but found no way to get information about a title from the APIs listed. Any tip or guidance is much appreciated!