Here is the full list of all 15 Lighthouse of guiding flames achievements.
Unlock the whole gallery
Get bad end
Get dead end
Find the Keeper without a mask
Get the ending of Resignation
Get all three endings
Discover the special taste of scarlet tea
Look at Survival Lessons
Get the ending of the Fight
Get the Getaway Ending
Learn the story of an ancient deity
Learn all the tea varieties
Watch out for the wind
Sacrifice yourself for family
Start the game a second time from the beginning