Full list of Forza Horizon 2 (Xbox 360) achievements and guides to unlock them. The game has 46 Achievements worth 1000 Gamerscore and takes around 60-80 hours to complete. Coming this fall for Xbox 360, Forza Horizon combines the automotive thrills that Forza fans expect with a gorgeous open-road world that begs to be explored. From the Manufacturer. Forza Horizon is where cars belong Speed, style and freedom on the open road Forza Horizon is an action-racing game with authentic Forza feel, set on the open roads.