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