The lights are on
Since Ubisoft didn't build a way to track your challenge progress, I made one to keep from going back and forth missions to figure out what I was missing.
The Ghost Skill Rating is a rating system for each Campaign Mission. The Score is used for completing one Challenge and unlocking two achievement / trophies. They are Qualified and Good Enough for Government Work.
The Ghost Skill Rating is based on seven factors:
Each level has a required amount of points to equal 100 ghost rating each level and it's requirements are as follows:
Ghost Skill Rating information taken from IGN's GRFS Wiki Guide.