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