Here is the full list of all 25 Dungeon Of Dragon Knight achievements.
Quit tavern without spending a penny
Find a secret place
Finish the tutorial level
First time fall in the a hole trap
Click on witch 100 times
Cast a spell
All characters wearing armors;
Put on a set of archer armors
Get the best magic weapon
Kill the first monster
Resurrect a player
Kill 50 monsters
covered 90 percent of the dungeon tiles
Finish the first level
Finish first three levels in old school mode
Kill a monster with only one hit
Learned at least 5 kinds of skills for one character
First time finish the game
Wearing a set of baggar suit
Spent 100000 in one shopping time
Understand the story
Get the three kinds of magic sword
Get the set of General Suit
Carrying 200000 GP
Get the set of Wizard Suit