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