Absolutely Flawless

This achievement requires you to complete the tutorial without taking any damage. This means you must start a new game and select "play intro", then make your way through the Kobold mines and defeat the first Dragon Princess without getting hit once. It may take you a few attempts but careful movement and patience will see you through it. You really only have to fight the Dragon Princess if you just run by the bats and there is a save point just outside her arena, so the retry time for failed attempts is very forgiving.