Modding Achievements For Backwards Compatible Games

So I just beat Mass Effect 1 for 360. However it was done through Xbox One’s emulator system with backwards compatibility. So Im curious if anyone may know if its possible to mod the rest of the missing achievements through horizon (if you have a profile on a USB). cough asking for a friend, do you have to wait for the 360 modded achievements to update on the ONE? I only added a couple to test to see if it works. Though I had to go through unconventional methods.

I believe that xbox one doesn’t really emulate xbox 360 games and they have instead choosen to make edited versions of xbox 360 games compatible with xbox one. This could make the console see them as different games and in turn give them seperate achievements.