This is a relatively easy achievement to unlock, though there is some RNG involved. First you must encounter either a Stranger or Event card while playing as the Illusionist, and they must also give you a Wish, but only if you're of a certain alignment. Examples of such cards are the Fairy card and the Phantom card.
Once such a card is drawn, it often remains on the board until it's been used, so you can try over and over again.
Once you encounter such a card you get the option to Obscure your Alignment. Choose this option and roll a 4-6 on the die. If you roll 1-3 you can reroll once using a Fate point, but otherwise you'll have to land on the space again or encounter another card. Either way, if you roll a 4-6 and then choose the correct alignment that lets you get the wish from that card(f.ex. Good for the Fairy card, or Evil for the Phantom card), you get to choose from the list of wishes as if you were of that alignment, and the achievement unlocks.