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