The Horizon 10-Year Anniversary Title update for Forza Horizon 5 has 8 achievements.
Complete the 'Welcome to Mexico' chapter of the 'Horizon Origins' Story
Smash all 4 Bonus Boards in the 'Horizon Origins' Story
Complete all chapters of the 'Horizon Origins' Story
Earn 3 stars in all chapters of the 'Horizon Origins' Story
Win your first Midnight Battle
Win every Midnight Battle
Complete all chapters of the 'Made in Mexico' Horizon Story
Earn 3 stars in all chapters of the 'Made in Mexico' Horizon Story