Emulator QuickNESS easy to install from the menu of unstable functions. Remains only to specify it as the core when you first start any NES game (press A the button while the menu is displayed). Achievements works fine.
I have another problem: Super Mario World 2 (USA) for SNES in my profile at retroachivements.org recognized as Driver 2 Advance (Gameboy Advance). When you run the European version the screen displays a message: In this game there is no Achievement.