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