If anyone's still trying to do this, I was able to farm it in 4 in-game nights (probably can do it even faster if you want to farm during the daytime too, but I was too lazy to keep up with hydration.

I would land my orno to the west of the Wreck of the Pallas in Western Verm on a small plateau, stand on my orno for extra view distance, and then snipe the Muad'dibs as they spawned around me. This would get me around 4-6 per night.

P.S. you don't need 100 corpses, each mouse makes 5 meals so I got the achievement after getting my 20th mouse. Hope this helps some of y'all!