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