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