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