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