This might help some. Master Researcher Guide
I found this on Youtube. I didn't make it but I noticed most guides here were a tad harder to follow and the video ones no longer work.
Keep in mind you cannot use some of the expansions on guns for the achievement.
"Don't believe in the you that I believe in. Believe in the you that you believe in." - TTGL
Great words to live by. But I go with. "Do your best at everything. Always be strong, be fierce, and don't let others hold you back. Most of all don't hold yourself back." - K