Here is the full list of all 13 The Lords of the Earth Flame achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
Take the crown
Open comic ending of the game.
Open glossary.
View a map of the World.
Finish the game without dying.
Take the ruby
Finish the game of death.
Finish the game.
Select the alchemist
Take the knife
Romance with Gerda
Help the wounded
Starting a game for the first time.