I've taken the same Adobe Certified Master - Adobe Analytics Architect certification twice, and also the Adobe Certified Professional - Adobe Analytics Developer once. For completeness, there's also the Adobe Certified Expert - Adobe Analytics Developer.
What I've found is that Adobe has basically separated all of the Analytics' technical functions between these 3 certifications based on how "advanced" those functions are. This is my understanding of the function groupings per certification:
- Adobe Certified Expert - Adobe Analytics Developer: Basically, you'd need to be familiar with AppMeasurement and how to implement props, eVars and events. So JavaScript knowledge is a key requirement.
- Adobe Certified Professional - Adobe Analytics Developer: You need to know about report suite settings that affect data, like Classifications, Processing Rules, and similar.
- Adobe Certified Master - Adobe Analytics Architect: In my opinion, this tests how well you can plan an Analytics implementation. So you not only need to know about report suite settings, but also their implications in reports. There are also some questions around their tag manager, AEP Data Collection Tags. In my second certification, I also found questions about data privacy and security.
It's quite a weird way to split up the functions between the 3 certifications, but I guess that's how Adobe deems it to be suitable.