Step 1: From the main menu, select Config:

Step 2: Adjust your settings like this:

Only the settings regarding auto mode are important.

Step 1: From the main menu, select Start:

Step 2: It will take a while, but eventually you'll reach this screen:

Step 3: This is important! Click that auto button, son!


Step 4: Keep clicking Continue whenever this screen appears:

Congratulations! You just completed the game and earned 12 out of 14 achievements!

You're missing 2 more achievements. Here's how to get the first.

Step 1: From the main menu, select Extra:

Step 2: Click All Cast Review Session:

Step 3: This is important! Click that auto button, son!

One more to go. Are you not entertained?

Step 1: From the main menu, select Extra:

Step 2: Click View TIPS:

Step 3: Utilize your deep knowledge and amassed gameplay experience, most importantly the mastery of auto mode.

Well, you 100%ed the game. Tell all your friends, update your AStats profile, rate/fave/share/comment this guide and feel good about yourself! Now that you've got the time, you can even read this visual novel!
Also, you probably didn't get any trading cards because you finished too quickly. And yeah, if you're wondering, they don't drop anymore unless you played the game (any game as far as I can tell) for at least two hours.