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