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.
Romance with Gerda
Open comic ending of the game.
Take the crown
Select the alchemist
Take the ruby
Take the knife
Finish the game of death.
Help the wounded
Open glossary.
Finish the game without dying.
Finish the game.
Starting a game for the first time.
View a map of the World.