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