Forza Horizon 2 offers a wide array of achievements that reward you for completing various tasks, from winning championships to performing specific skill moves and collecting cars. Here's a general approach to unlocking them:

- Campaign Progression: Many achievements are tied to completing the main championships and the Horizon Finale. Simply playing through the story will unlock a good portion.
- Side Activities: Completing Bucket List challenges, finding all Barn Finds, and achieving 3-star ratings on Speed Traps, Speed Zones, and Danger Signs will unlock several achievements.
- Car Collection: Achievements exist for owning a certain number of cars, or specific types of cars. Focus on diversifying your garage.
- Skill-Based: Some achievements require performing specific skill chains (e.g., a 100,000 point skill chain) or achieving a certain number of specific skill types. Practice your drifting, airtime, and near misses.
- Online Achievements: A few achievements require participating in or winning online events. Jump into online Freeroam or races to tackle these.
- Exploration: Driving every road, smashing all Bonus Boards, and discovering all locations will also yield achievements.
Check your in-game achievement list regularly to track your progress and identify any specific tasks you need to focus on. Many achievements will naturally unlock as you play, but some require dedicated effort.