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