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