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