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