I have the same problem on Mac OS (M2) both GTK and SDL versions don't register movement with fire button held down. Also it's nothing to do with the joystick, it's the same when mapping keys to the Keysets.
Classic example of missing the point.
I'd be happy to provide a detailed document with as much information as possible.. and also to help out implementing the feature. At a high level for achivements to work, roms must be modded to add the condition for an achievement to be met, some way to notify the emulator, and the emulator must have a way to communicate this to the achievements server. The acheivements server exists already, the only thing missing is support in VICE, and any modded roms. But we can't mod roms until support from...
I'd be happy to provide a detailed document with as much information as possible.. and also to help out implementing the feature. At a high level for achivements to work, rom's must be modded to add the condition for an achievement to be met, some way to notify the emulator, and the emulator must have a way to communicate this to the achievements server. The acheivements server exists already, the only thing missing is support in VICE, and any modded roms. But we can't mod roms until support from...
Add support for Retro Achievements modded games