Realms of Arkania: Blade of Destiny

Cursed items are pretty rare in the game, but easy to recognize. They will always be labeled as "cursed", so the only things you need to do when you find one is identify its cursed properties, and then equip it to use in battle.

If you don't know where to find a cursed item, a good location to visit is Runinshavn, the island below the bay of Prem. Travel to the lighthouse, and then take the middle path when asked. This will lead to a cave. In the cave, on the second level, is a chest atop a small hill. Inside will be a cursed chest piece.

Once you have the chest plate (or whatever other item you have), you need to identify it. You can do this via a mage with the spells "breath of magic" and "analytica". I personally used Delo, who's a magician. He's a default character so you can grab him from a temple if you don't have a current party member who works. I would also use both spells to be sure that you've activated the item. Just press to open the combat wheel and choose to use a spell. It will show you the cursed item if you succeeded in identifying it.

Finally, after it's identified, just equip it onto a character. The items are still class-specific, so if you have the chest piece, only a warrior can equip it. After that, enter any kind of battle, and the achievement will pop soon after. You don't have to win the fight for it to register.