Mirror of Merlin and Shield of Achilles
Well, actually its Merlin's Mirror, and Shield of Achille (this is a fact that originated in the King's Quest Companion, and brought up in the official KQ6 and KQ7 strategy guides). I think its only been referred to as the "Shield of Achilles" a single time in the An Encyclopedia of Daventry (1st and 2nd edition of the Companion).
In the original KQ1, and most of the games they are simply known as the magic mirror (the Mirror), the magic shield (the Shield), and 'the Chest' of gold.
BTW, while its nice to have a screenshot of the unofficial AGDI version of KQ1, wouldn't it be a good idea to add screen shots of the official versions of the games (AGI and SCi versions?) to honor the heritage of the series.