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