Is there a list/explanation of r. console commands?

Development Rendering
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You can find them listed in engine source code with explanations (remeber that you need engine source code access and github accout tied to you unreal profile)

https://github.com/EpicGames/UnrealEngine/blob/35d8b371a10392565bfc68ddb6f9b52aa3ba4bbf/Engine/Source/Runtime/Core/Private/HAL/ConsoleManager.cpp#L1297

But considering theres is description coded in there might be commend to show this description, thru viewing it in that source code might be nicer then picking single commands