Here is the full list of all 31 Rack N Ruin achievements.
Finish the game on the Hard difficulty.
Beat the game in less than 1 hour and 45 minutes.
Finish the game.
Destroy Ruin without using healing items.
Kill 5000 Enemies.
Earn 150,000 Souls.
Destroy the Demon Governor using only the Demon Horn.
Collect all usable items, upgrade items, and ability upgrades.
Unlock all key doors.
Use 10 Wisp Dusts.
Resurrect Sally.
Find all 10 Souls of the Innocent.
Corrupt all the shrines.
Defeat all the wave spawners.
Destroy the Goddess.
Destroy the Goddess without using abilities or spellbooks.
Kill a Leopard Guardian without triggering the roll.
Enchant the amulet.
Escape the Crystal Prison.
Destroy the Crystalized Hero in less than 105 seconds.
Feed the Pile of Gunk to Norbit the demon.
Fully stock Baba Yaga's shop.
Banish Nihil.
Destroy the Guardian without ever taking damage.
Solve the Vampiric Ring riddle.
Destory a Water Elemental.
Defeat Amon.
Destroy Amon without using fire damage.
Hit a bomb with the Blade of Ruin.
Corrupt the first shrine.
Find The Groto secret.