Here is the full list of all 24 Tales achievements.
You solved the tavern riddle in one attempt!
You solved the password riddle and gained entry to the inn!
You were curious about The Wizard of Oz tale!
You escaped the prison of Uruk, great!
You travelled into a book and met Merlin the wizard!
You completed the Gilgamesh tale!
You completed the Jack and the Beanstalk tale!
You completed the Gargantua and Pantagruel tale!
You completed the Sisyphus and Bellerophon tale!
You completed The Divine Comedy tale!
You defeated Oblivion and saved the Tales!
You escaped from the Mayan temple!
You found Thor's legendary hammer!
You completed the Popol Vuh tale!
You completed the Around The World In 80 Days tale!
You visited Merlin for advice only when strictly necessary - the rest was your own wizardry!
You spoke to many, many characters about many, many things!
You made sure to examine and look at many things throughout your tale!
Using superior engineering skills, you fixed the mill mechanism in one single swift swoop!
You opened both Panurge's box and the Giant's box on the first attempt!
You solved Athena's riddle in 1 or 2 attempts!
You solved the Mayan Creation Myth puzzle in 1 or 2 attempts!
You played the game from start to end without autosave or saving!
You completed every achievement!