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