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).
Play the game for at least 20 hours.
Mock the traitor.
Defeat the brothers.
Defeat the asteroids.
Defeat the son.
Defeat the trademarked chemical.
Defeat the doppleganger.
Beat the game... twice.
Find all the runes (purchase not necessary).
Defeat the last boss.
Defeat the boss in the Land of Darkness.
Put at least one point in every skill in the manor.
Have one rune equipped in every item slot.
Defeat the boss in the Maya.
Defeat all the minibosses.
Read the last journal entry.
Use the special class at least once.
Beat one of the clown's games at least once.
Open your very first gold chest.
Reach level 50 or higher.
Defeat the boss in the Forest Abkhazia.
Have one piece of equipment in every item slot.
Defeat the boss in Castle Hamson.
Die 20 times or more.
Earn your very first Enchantress rune.
Kill a chicken.
Choose a hero with no traits.