1. A Series of Unfortunate Events (2004)
2. Lemony Snicket's A Series of Unfortunate Events (2017-2019) - This is a Netflix series, not a single movie, but it spans three seasons and covers a large portion of the book series.
3. The Bad Beginning (2004) - This is actually a short film that serves as a prequel to the 2004 movie.
So, technically, there are two feature-length movies, and a prequel short film.