Here is the full list of all 22 Mistwood Heroes achievements.
Go through the Death Maze.
Get a gift from Santa.
Rescue the princess.
Dig all the graves.
Get a shovel.
Beat the game.
Pass the "Test of Fire".
Pass the "Test of Fire" without touching the fire.
Kill Madam Randomize.
Forgive Steve several times.
Survive against Immortal Legion.
Kill Daniel Darknet.
Give the Death Book to Jenny Whitemind.
Go through the Nightmare Cave.
Kill Carl Cutthroat.
Get the Lightcalibur.
Help to Balter Black.
Kill Jeremy.
Kill the traitors.
Kill Brenda.
Kill Mr. Lucky.
Leave the house.