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