Here is the full list of all 23 Myth of Mirka achievements.
Defend the Town of Mirka
Tell the truth
Find the secret military base
Drink a white potion
Spontaneously combust
Drink a purple potion
Turn into a tree
Admit to murder
Find a cure for Mirkanism
Run for several hours
Pray to the Gods
Throw a rock at the creature
Find a yeti in your bed
Freeze to death
Scream for help
Look in the cabin window
Milk was a bad choice
Get locked up
Get executed by Super Soldiers
Feed a Super Savage
Kill and eat the Town of Mirka
Donate your body to science
Resurrect Henri