In this achievement tutorial for the hit title, Assassin's Creed 2, you'll be doing some diving. But you won't be diving into any water, instead it will be a small cart carrying hay.
The name of this achievement is called High Dive and to get this, you'll have to perform a leap of faith from the Top of Florence's Giotto's Campanile. It's a really tall building, but it's also an easy achievement to get. Good luck and enjoy!