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