This achievement is earned by answering 50 questions about Comedy movies. Since the movies & questions are random, you will get this eventually through repeated play. If you feel the need to cheat, reference WWW.IMDB.COM while playing and you can be sure to get the questions right.
Aside from cheating, play Short or Long games with one player so that you can take as much time as you need to answer the questions. Point values are not important to this Achievement.
The Achievement will unlock at the end of the round in which you answer your fiftieth Comedy movie question.