I've tried multiple times in the past to get Steam achievements to work in my Construct 2 projects but I never got it to work. I've been researching all day about it again and it seems that it hasn't really changed, you still need that specific version of NW and the plugin or something. Is there a way to actually get it to work in 2020?
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Have you made sure you are using the Greenworks plugin's specified version of Steam SDK and nw.js?
It has completely changed thanks to the Construct Community. The process itself is mostly the same. You have to select your Greenworks addon and follow the instructions given. What's new, is that you can now run with any version of NWjs using these custom prebuilds.