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