"Ακούω ειδήσεις" is a fixed combination of a verb and a noun, like "πάω σινεμά", "βλέπω τηλεόραση" κ.τ.λ.
However, if it's about the news you watch on TV, you can also say "βλέπω ειδήσεις".
In addition to the answers above by nickthegreek992, "ακούω" also means "to receive an information", similarly to "to hear (about)": Did you hear about the earthquake in Japan? - Άκουσες/Έμαθες για το σεισμό στην Ιαπωνία;
Did you hear that Mr. Johnson has died? - Άκουσες/Έμαθες/Πληροφορήθηκες ότι ο κύριος Τζόνσον πέθανε;