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