Microsoft Certified: Azure Fundamentals
I got this one because it was free after doing some online training through Microsoft. But - it was about time I got it.
I've been using Azure since it came out but never got certified because there's a lot of Infrastructure stuff in the exams which don't particularly interest me as a developer. In saying that, I found the exam material high level enough to be interesting and I managed to fill in a few gaps.
Most notably - I enjoyed playing with the Azure Infrastructure map. It's a cool visualisation tool that lets you explore all the Azure infrastructure, all the datacentres, undersea cables, even satellites. You can take a virtual tour of a datacentre and learn about Azure in space! Cool stuff.