There are 242 clues in the game.
95% of 242 is roughly 230, so thats where you'll get it.
I got it during the last case, and I missed a couple in one other case
Originally Posted by justin5000
I completed the game with 227 and no dice on the achievement popping. I went to the last case via the cases menu and completed it again, and it says I have 7 clues found. So then I went to the last case via resume and it starts me at the beginning of the car chase, where I have no opportunity to to search Dr. Fontaine's office or Tex's shack. Anyone else having this problem or know how I can get my few more clues for the achievement?
You have to start the case again. Go to it through "Cases" on the main menu