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