Here is the full list of all 95 DUNGEONS OF CHAOS achievements.
FIND THE STASH OF 'vs undead' WEAPONS ON THE STARTER ISLAND
FIND A GOOD SLING IN THE RAT CAVE
FIND A NICE RING IN THE SHELTER
OPEN THE KNIGHT'S CHEST HIDDEN IN THE SPIDER LAIR
RANSACK THE 4 SMASHED CHESTS OF GOLD DEEP BELOW THE TOMB
FIND A WIZARD'S STAFF IN AN ORCHARD
OBTAIN A HEAVY RING FROM A DEAD MAN'S HIDEOUT IN A WET UNDERGROUND PLACE
OBTAIN THE TREASURE GUARDED BY THE PIXIES
OPEN A PARTICULAR CHEST ON THE TOP FLOOR OF THE LICH TOWER
OPEN THE CHEST IN THE DRAGON STASH ON THE STARTER ISLAND
OBTAIN THE SNOWY TREASURE DEEP WITHIN THE ICE
DEFEAT THE ANT QUEEN DEEP INSIDE THE ANT COLONY
DEFEAT THE EVIL LICH IN HIS TOWER
DEFEAT A DOZEN SHADOW PIXIES IN THE LAVA CAVE
DEFEAT 3 SHADOW BEASTS DEEP BELOW THE UNDEAD WIZARD'S TOMB
DEFEAT A WYRM DEEP BELOW THE UNDEAD WIZARD'S TOMB
FIND THE VAMPIRE'S CHAMBER IN THE CATACOMBS AND DEFEAT HIM
PREVAIL AGAINST THE FIRE ACOLYTE IN THE ZOMOK TEMPLE
DEFEAT THE MINOTAUR OVERLORD IN THE BESIEGED CASTLE
FIND AND DEFEAT A WISP, FOR EXAMPLE IN THE DEEP TUNNELS UNDERNEATH THE CASTLE
FIND AND DEFEAT AN ANCIENT DRAGON, FOR EXAMPLE IN THE DEEP TUNNELS UNDERNEATH THE CASTLE
DEFEAT AN UNDEAD DRAGON, FOR EXAMPLE AFTER PROVOKING ZOMOK
HAVE ONE PARTY DEFEAT MEMBERS OF 66 DIFFERENT MONSTER SPECIES
HAVE ONE PARTY DEFEAT MEMBERS OF 82 DIFFERENT MONSTER SPECIES
SURVIVE ALL RAT PRACTICE WAVES THAT WORTAS PREPARES
RECORD ZERO PLAYER DEATHS ALL THE WAY TO THE CHAPTER 2 CHASM FIGHT
RECORD NO MORE THAN 10 PLAYER DEATHS ALL THE WAY TO THE CHAPTER 2 CHASM FIGHT
SURVIVE ALL 3 WAVES OF STONE GOLEM IN THE CHAPTER 2 RIVER CITY ARENA
SURVIVE ALL 3 WAVES OF CUTE BUNNIES IN THE CHAPTER 2 RIVER CITY ARENA
SURVIVE BOTH FIRE AND ICE WAVES IN THE CHAPTER 2 RIVER CITY ARENA
SURVIVE ALL 3 MAGIC WAVES IN THE CHAPTER 2 RIVER CITY ARENA
MAKE NO ITEM PURCHASES ('BUY') IN SHOPS UNTIL END OF CHAPTER 2 CHASM FIGHT
WIN THE GAME BY DEFEATING THE CHAOS LORD
FIND A STELLAR PIECE OF ARMOR STORED IN TARTESSOS
OPEN THE CHEST YOU ALWAYS WANTED BUT COULD NOT HAVE BEFORE
DEFEAT THE ARCH-LICH THAT HAS REEMERGED IN BRACYA
SECURE ALL 12 ALLIES FOR AN END FIGHT
DEFEAT THE UNDEAD RYLD THAT HAS FOUND A NEW HOME
DEFEAT RAMATH THE FEMALE NECROMANCER
MAKE THE THIEF APPEAR THAT STEALS MONEY FROM YOU AND OTHERS
COMPLETE THE CHAMPIONSHIP CHALLENGE IN MADOC'S ARENA
FIND A PARTICULAR TREASURE IN A PARTICULAR TREE
WIN AN ARENA CHALLENGE AGAINST A SET OF FURNITURE
DEFEAT A FIRE TITAN IN REAL BATTLE (NOT ARENA)
DEFEAT CHRIS THE CRYPT KEEPER
DEFEAT TRAZ THE VILE SERPENT CREATURE
BE AWARDED ACCESS TO THE INNER ELF CITY
OPEN THE FIRST CHEST FROM THE FABCAB RIDDLE
OPEN THE SECOND CHEST FROM THE FABCAB RIDDLE
OPEN THE THIRD CHEST FROM THE FABCAB RIDDLE
DEFEAT NOSOS THE MASTER OF POISON
COME OUT OF THE WOODS VICTORIOUS
COMPLETE THE ARENA CHALLENGE AGAINST HIGH LEVEL MONKS
SURVIVE ALL WAVES IN THE BUNNY REVENGE CHALLENGE
HAVE ONE PARTY DEFEAT MEMBERS OF 100 DIFFERENT MONSTER SPECIES
HAVE ONE PARTY DEFEAT MEMBERS OF 125 DIFFERENT MONSTER SPECIES
DERIVE A HAPPY ENDING FOR DAKLOS
SURVIVE THE WARRIOR TRIAL ARENA CHALLENGE IN TARTESSOS
SURVIVE THE KNIGHT TRIAL ARENA CHALLENGE IN TARTESSOS
SURVIVE THE SAMURAI TRIAL ARENA CHALLENGE IN TARTESSOS
SURVIVE THE BERSERKER TRIAL ARENA CHALLENGE IN TARTESSOS
SURVIVE THE MARKSMAN TRIAL ARENA CHALLENGE IN TARTESSOS
SURVIVE THE ASSASSIN TRIAL ARENA CHALLENGE IN TARTESSOS
SURVIVE THE PRIEST TRIAL ARENA CHALLENGE IN TARTESSOS
SURVIVE THE EXORCIST TRIAL ARENA CHALLENGE IN TARTESSOS
SURVIVE THE GEOMANCER TRIAL ARENA CHALLENGE IN TARTESSOS
SURVIVE THE WIZARD TRIAL ARENA CHALLENGE IN TARTESSOS
SURVIVE THE WARLOCK TRIAL ARENA CHALLENGE IN TARTESSOS
SURVIVE THE ARCHMAGE TRIAL ARENA CHALLENGE IN TARTESSOS
WIN THE CHAPTER 2 CHASM FIGHT WITH A 'DARK LORD' FEAT PLAYER
WIN THE GAME WITH THE FIXED 'DRAGONS' PARTY SETTING
WIN THE GAME WITH THE FIXED 'PRESIDENTS' PARTY SETTING
WIN THE GAME WITH THE FIXED 'MONKS' PARTY SETTING
WIN THE GAME WITH THE FIXED 'TROLLS' PARTY SETTING
WIN THE GAME WITH THE FIXED 'FELLOWSHIP' PARTY SETTING
WIN THE GAME WITH THE FIXED 'DARK LORD' PARTY SETTING
WIN THE GAME WITH THE FIXED 'STRANGE' PARTY SETTING
WIN THE GAME WITH THE FIXED 'MISFITS' PARTY SETTING
DEFEAT THE DRACO LICH IN THE OLD KEEP
SURVIVE THE SECOND VERIDRAC ARENA CHALLENGE IN ZOMOK'S ARENA
SURVIVE THE SECOND KURGALLA ARENA CHALLENGE IN ZOMOK'S ARENA
SURVIVE THE CHROMATIC LINDWURM ARENA CHALLENGE IN ZOMOK'S ARENA
SURVIVE ALL WAVES IN THE DRAGON BOSS CHALLENGE IN ZOMOK'S ARENA
WIN THE GAME WITH THE FIXED 'THE CLAN' PARTY SETTING
WIN THE GAME WITH THE JUST-BARDS 'FURIOUS SIX' FIXED PARTY SETTING
REACH PROFICIENCY 75 OR MORE IN THE 'GET DRUNK' BARD SKILL
EQUIP AN INSTRUMENT WITH A SONG AT POWER 60 OR MORE
REACH PROFICIENCY 90 OR MORE IN THE 'GET DRUNK' BARD SKILL
EQUIP AN INSTRUMENT WITH A SONG AT POWER 80 OR MORE
SURVIVE THE AVATAR'S REVENGE IN THE TARTESSOS ARENA
SURVIVE BOTH WAVES OF PIRANHAS IN THE SHIPWRECK ARENA
SURVIVE BOTH WAVES OF EELS IN THE SHIPWRECK ARENA
SURVIVE BOTH WAVES OF SHARKS IN THE SHIPWRECK ARENA
SURVIVE BOTH WAVES OF SIRENS AND JELLYFISH IN THE SHIPWRECK ARENA
SURVIVE THE KRAKEN CHALLENGE IN THE SHIPWRECK ARENA