100% completion in the Xbox 360 version of Forza Horizon 2 requires mastering all festival events, finding every collectible, and completing specific late-game challenges. Unlike the Xbox One version, which features different map progression and additional content, the 360 version focuses on a core set of milestones. Official Forza Community Forums Core Completion Requirements
Collectibles & Exploration: All 130 reward boards (billboards) smashed and all roads discovered. Forza Horizon 2 Xbox 360 Save Game 100 Complete
Roads: Drive on every unique road across the Southern Europe map. 100% completion in the Xbox 360 version of
All 168 Championships: Every racing event across the map is finished. Microsoft Services Terms : Using another user’s save
Important Disclaimer: This process involves moving files onto your Xbox 360 hard drive or USB drive. This is typically done using modding tools or file transfer programs on a PC. Doing so violates the Xbox Live Terms of Service and can result in your console being banned from online play. Additionally, if the save file is "modded" (has unlocked cars or credits added illegitimately), Turn 10 Studios/Polygon often flags these accounts, which can ban you from the leaderboards or online servers.
Disclaimer: Modifying save files violates the Microsoft Code of Conduct and the Forza Terms of Service. While enforcement for FH2 on Xbox 360 is non-existent post-server shutdown, proceed at your own risk. Always back up your original saves.
All Cars Mod: Users on JTAG/RGH consoles often use the XE Mod (Extended Edition) to unlock all cars from both the Xbox One and Xbox 360 versions.