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