RetroPie now includes Quicknes in its setup menu under the experimental section.
To get achievements working on the Nes core system.
Make a folder in your home directory and call it Quicknes.
After you have done that you need to Git Clone into that folder.
git clone https://github.com/libretro/QuickNES_Core.git
Next go ahead and compile the project:
Go to the QuickNES_Core folder and run the make file
cd QuickNES_Core make
this will take a while
Loaded SSH on the PC and connected to your Pi.
Now after this is complete you will want to take note of the location of this file.
Now you will want to edit
You will want to add this to line 4/Bottom of the page.
quicknes="/opt/retropie/emulators/retroarch/bin/retroarch -L /home/pi/QuickNES_Core/quicknes_libretro.so --config /opt/retropie/configs/nes/retroarch.cfg %ROM%"
You will also want to edit line 2 to
save and upload.
Now reload retropie and enjoy Nes with achievements.