I made this video for the Matchstick Eyes, but it works for this as well. I've found Adventure to be the easiest, but that's me. Make sure you save it every few hours to make sure the time saves. If you leave it overnight, back out first thing in the morning so you can get the hours.
I'm pretty sure that even if it glitches, you get some time credited to the achievement, but I'm not entirely sure.