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