The loader (SmartSteamLoader.exe) relies on a .ini file in the same folder to function. You can "generate" the necessary settings by editing the template:
Some versions of the launcher (like the "SSELauncher comfy edition") have an added feature to . smartsteamloader
SmartSteamLoader itself doesn't generate achievement data. If you want achievements to show up, you typically need to use a separate script or tool: The loader (SmartSteamLoader