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