Here is the full list of all 12 Dragon's Lair achievements.
Get the highest possible score (427,469).
Complete the game without dying.
Play Dragon's Lair on its Anniversary: June 19
Complete the game with the move guide turned off.
Dirk dies via asphyxiation in the bedroom scene.
Complete the game in Hard mode.
Complete the game on Arcade Mode
Complete the game on any mode.
Get off on the elevator on the last floor.
Lose your last life in the Drink Me scene... Watch Carefully!
Use the shortcut in the Giddy Goons room.
Never make a correct move in a new game.