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