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.
Play the game for at least 20 hours.
Mock the traitor.
Defeat the brothers.
Defeat the son.
Defeat the asteroids.
Defeat all the minibosses.
Defeat the doppleganger.
Defeat the trademarked chemical.
Find all blueprints (purchase not necessary).
Beat the game... twice.
Find all the runes (purchase not necessary).
Defeat the last boss.
Put at least one point in every skill in the manor.
Read the last journal entry.
Defeat the boss in the Land of Darkness.
Defeat the boss in the Maya.
Defeat the boss in the Forest Abkhazia.
Use the special class at least once.
Have one piece of equipment in every item slot.
Reach level 50 or higher.
Have one rune equipped in every item slot.
Kill a chicken.
Defeat the boss in Castle Hamson.
Die 20 times or more.
Earn your very first Enchantress rune.
Open your very first gold chest.
Beat one of the clown's games at least once.
Choose a hero with no traits.
WITHOUT using the Architect, complete the game dying 15 times or less