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MW2 Challenges Free for iPhone guide tells how to get all the titles and emblems in Modern Warfare 2, including unlocks from hidden and prestige challenges. All the titles, emblems and challenges are laid out just like they are in the game, so its quick and easy to get what you want. If you tap a title or an emblem, it will tell you what challenge earns it. If you tap a challenge, it will show you the rewards for each step, including titles, emblems, XP rewards and other rewards like Ghillie suits or weapon camos.
Version 1.2 corrected the weapon master emblems, which should be awarded for completing the second step of the challenge, fixed the display of some emblems, notably the predator missile, and fixed a bug where tapping the second title of a challenge that awards 2 titles, such as "You're Fired I" would not go the title detail page.