How to retrieve quarterly as-reported fundamentals data for MSCI ACWI constituents via Eikon Data API?
We are pleased to see you use the forum. Would you mind using it as a bank of answers, checking if your questions have already been answered in previously asked questions? E.g.1.: you can find constituents of any index as per this answer.
You can get any fundamental data historically if it is available as a field starting with 'TR.' in the Data Item Browser (before using it with Eikon Data API) as per this video.
Please do not hesitate to revert on this question with details on the historical fundamental fields you are after if the above does not answer your question.