In fact, the "Alcampo" in Madrid2 (also called la Vaguada) is very similar to "Auchan" In France. It's the same brand but they changed the name. Expect to find the same things. Besides Alcampo, you have a fresh fruit, vegetables, meats, fish market ("old style") on the lower floor; it's more expensive than Alcampo but the quality is great.
As Miguelito said, there're also lots of Spanish fashion stores (Zara, Trucco, Cortefiel, Massimo Dutti, Tintoretto, Cedosce, Bershka, Mango, Don Algodon,...). The upper floor has cafes, restaurants and a cinema.