To go along with the other solution, I want to note that the achievement does not pop right away. In fact, it doesn't pop for quite some time. It doesn't pop until after Julia follows up with Devin for Longshot.
So don't freak out. If you have a high IQ, it'll pop after a while. I had an A+, but my Performance was an A and I got that achievement. I don't know what the cutoff is.
Hope this helps!