Simply complete the game without ever using the 'Hint?->Get Solution' within the notebook
It's impossible to do accidently if you wanted to play through without help, and the fantastic walkthrough here on TA will guide you through the game without needing this feature
For those who are having difficulty unlocking, from the comments:
"I had the same problem. I open xbox on my pc (not companion), I go in to my profile and I click on the game and the last achievement popped" - seems that the achievement completes but doesn't process; try doing the same as Du4lity 😊