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