Realms of Arkania: Star Trail

It’s best to get this out of the way as soon as possible. All you need to do is remove all the clothing from your characters via the inventory screen. You do not need to remove your weapons, just the pants. But it’s worth stripping everything for the sake of getting the other achievement for winning a battle without clothes.

Once your characters are nude, just travel around the cities until you get the random encounter with children. You’ll be told that the locals have beat you up for being nude, and the achievement will pop.