Here is the full list of all 29 Rogue Legacy achievements. It takes around 50-60 hours to unlock all of the achievements on Windows.
Play the game for at least 20 hours.
Mock the traitor.
Defeat the brothers.
Defeat the trademarked chemical.
Defeat all the minibosses.
Defeat the doppleganger.
Defeat the asteroids.
Find all the runes (purchase not necessary).
Find all blueprints (purchase not necessary).
Have one rune equipped in every item slot.
Beat the game... twice.
Defeat the son.
Reach level 50 or higher.
Put at least one point in every skill in the manor.
Use the special class at least once.
Defeat the last boss.
Read the last journal entry.
Defeat the boss in the Land of Darkness.
Defeat the boss in the Maya.
Defeat the boss in the Forest Abkhazia.
Open your very first gold chest.
Beat one of the clown's games at least once.
Kill a chicken.
Defeat the boss in Castle Hamson.
Have one piece of equipment in every item slot.
Choose a hero with no traits.
Earn your very first Enchantress rune.
Die 20 times or more.
WITHOUT using the Architect, complete the game dying 15 times or less