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