This achievement is a little more annoying than the description would have you believe. There is no absolute way to tell if an item is breakable or not. One wrapped vase might be breakable, but the one next to it may not be. This is simply a matter of trial and error.
Hint 1: After your very first combat in the game you fall into a tomb, that first room has many destructible items and is the most concentrated area of them I have found. If you wish simply destroy them all then reload the checkpoint (Not sure if reloading checkpoints saves them, but if it does let me know)
Hint 2: Red vases are filled with oil or pitch (flammable black liquid anyway) the big ones are always breakable, just be careful not to be near a fire when you do this otherwise you will likely incinerate yourself.
Hint 3: If and when you acquire them, use dual swords for breaking items, they have a wide swing and fast speed so you can get it done quite swiftly. DO NOT USE HEAVY WEAPONS, takes longer and is less accurate.
EDIT: Thanks to DarkPaul64 for his comment, if you travel to Lysandro's Oracle offering just outside of Siwa there are many wicker baskets that can be smashed.
Let's keep cheevin' together!