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