Here is the full list of all 119 Unexplored achievements.
Kill the Conjurer.
Kill 20 enemies with the sword Fang
Slay the Cyclops.
Discover 10 levels while wearing the Duck of Doom
Destroy the Monstrous Vine
Become a vampire
Kill the Vampire Lord.
Defeat Big Jack
Defeat a Flesh Golem in The Dark Ritual.
Cast a spell to reveal a treasure in The Dark Ritual.
Defeat 12 Cultists in The Dark Ritual.
Face The Great Old One in The Dark Ritual.
Reach the court of the Crimson King in The Dark Ritual.
Explore all 10 levels of The Dark Ritual.
Defeat a Wraith in The Dark Ritual.
Craft a potion of Invisibility in The Dark Ritual.
Kill a Creep to acquire its blood in The Dark Ritual.
Acquire Holy Water in The Dark Ritual.
Acquire the Obsidian Dagger in The Dark Ritual.
Climb down a chasm in The Dark Ritual.
Break 5 clay figurines in The Dark Ritual.
Acquire the Silver Sword in The Dark Ritual.
Explore the Mansion's Library in The Dark Ritual.
Teleport back to the Mansion in The Dark Ritual.
Find the Ritual location in The Dark Ritual.
Find the Skull Key in The Dark Ritual.
Repair your sword after it was corroded in the Ripley Run..
Craft of Potion of Resist Fire in the Ripley Run.
Craft a Potion of Explosion in the Ripley Run.
Find another repeater crossbow in the Ripley Run.
Get 60 Hit Points in the Ripley Run.
Collect 7 Throphies in the Ripley Run.
Visit all 11 floors in the Mining Colony in the Ripley Run.
Kill 100 Creeps in the Ripley Run.
Defeat the Visitor Queen in the Ripley Run.
Kill 20 Poisonous Creeps in the Ripley Run.
Find the Staff of Lightning in the Ripley Run.
Don't fire your bow until you reach the Living Quarters in the Ripley Run.
Defeat the Infector in the Ripley Run.
Kill 100 Eggs in the Ripley Run.
Kill 100 Crawlers in the Ripley Run.
Score 250 Kills in the Ripley Run.
Collect 12 Potions of Explosion in the Ripley Run.
Defeat the Inquisitor in the Ripley Run
Defeat the Balrog of Moryondor as the Wizard.
Collect 72 arrows as the Elf Archer in Moryondor.
Unlock all owl doors in Moryondor.
Craft a Mithril Shirt in Moryondor.
Collect 12 pieces of Mithril ore as the Dwarf Warrior in Moryondor.
Explore the Hidden Library in the Great Hall of Moryondor.
Perform 20 stealth kills as the Halfling Rogue in Moryondor.
Destroy a powerful magic ring in the depths of Moryondor..
Craft a magic shield as the Human Warrior in Moryondor.
Find a magic bow in Moryondor.
Collect 12 rations in Moryondor.
Visit all 9 floors of Moryondor.
Open the tomb in the Great Hall of Moryondor.
Collect 1000 gold and treasure in Moryondor.
Defeat 24 Moryondor Goblins.
Defeat the Goblin King of Moryondor.
Bring light to a particular hall in The Underdark in Moryondor.
Craft a magic sword in Moryondor.
Identify all types of potions in a single run.
Create a fireball staff +5 as a Wizard on Hard.
Identify all types of scrolls in a single run.
Discover all levels in the Dungeon of Doom.
Trigger the Staff of Fiery Doom and live...
Enchant the repeater crossbow, 'cause you can!
Set off 12 bombs.
Set off 24 sacks of gunpowder as the Musketeer on Hard.
Identify the Minotaur's magic nose ring by wearing it.
Kill a boss with a pistol or musket.
Defeat Big Dog
As a Rogue score 50 stealth kills against Kobolds, Goblins, Ratlings, Harpies, or Orcs, on Hard
Forge a Staff of White Fire
As an Adventurer defeat 4 bosses on Hard.
Kill 100 rats in a single dungeon run.
Best the Goblin Master Swordmaster
Buy a picture from the Elven Vendor
Escape the Dungeon of Doom
Craft a Potion of Life.
Slay a real Dragon!
You used the a Staff of Steal Life to heal 20 times
Defeat a kobold mage.
Defeat 20 enemies with shuriken
As a Barbarian kill 50 enemies on Hard without healing or eating once.
Wear the Orc King's Crown
Craft a necklace of orc teeth.
Discover 12 levels on Normal or Hard without using more than 1 Potion of Strength
As a Cleric score 50 kills on Hard without using weapons that cause piercing or slashing damage.
As a Warrior kill 100 enemies with your starting sword on Hard.
Slay a giant poisonous rat.
Identify a sword by defeating 20 enemies with it.
Discover 7 levels in a hard game after starting without any equipment (except for your cloak)
Use a scroll to identified a cursed magic item.
Copy a Scroll of Enchanting.
Brew some tea.
Defeat a Winged Gargoyle.
Forge the Fire Ant Armor
As an Archer hit 24 enemy creatures in a row without missing once on Hard.
Put a Skeleton permanently to rest.
Put the Void Knight to rest
Use a scroll to identify a benevolent magic weapon or armor.
Disarm a trap.
Forge a runic item.
Pick a lock on a door or chest.
Defeat 20 enemies with the same trident.
Collect 48 arrows.
Discover 8 levels on Normal or Hard without using more than 1 Potion of Life
Recharge a spent magic staff.
Discover 4 levels on Normal or Hard without using any Healing Potions
Defeat 20 enemies with the same dagger.
Read a Scroll of Detect Magic.
Kill the Goblin Butcher
Defeat a goblin
Discover 5 levels in the Dungeon of Doom.
Defeat the Kobold Nine-Jah
Quaff an unidentified potion.
Reach the second level of the Dungeon of Doom.