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