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
Finish the game of death.
Take the ruby
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
Open glossary.
View a map of the World.
Starting a game for the first time.