The worst kind of crime

This is an achievement that can be obtained in the "Snowy Peaks" inside of the area's hidden cave. This requires the item "Hero Fists" beforehand to unlock the entrance, as well as having beaten the "Crypt of the Dead" at least once.

How to unlock
Inside of the first area of the cave, in the top right of the area, there is a glowy item spot outside of your reach - align Lyza from the right, look at it & interact with the wall to unlock the achievement. A cruel joke.

Trivia
This is a random fun fact about the achievement.