If this is through Retro Achievements then you can just grab one of their emulators on their website. The emulators are integrated with their server to add the achievement tracking functionality.

I believe if you've built a RetroPi with a Raspberry Pi, the built in emulators have the same functionality.

(And in following what Kolt said earlier, I just ran through Adventure Island 1 to 100% to get ready for all of us playing II)