The other solution is really great but if you are in a hurry you can catch this achievement in a few minutes in the first act or in any other act you are!
Note: Only questions that reward you with xp count for this achievement.
Follow these simple steps:
1-Save before you start answering;
2-Answer 10 or 20 questions (or more if you like) and be very careful about the correct
answers so you can remember them in the next steps;
4-Reload and answer the same questions again;
5-Keep doing this until you get the achievement.
I hope this will help you and save you some time. As always if you have any questions please comment below so that I can improve this solution.