Grand Theft Auto

The Grand Theft Auto series is mainly known for it's violent and criminal activites, but also for it's seemingly neverending list of collectibles, and heaps of side missions. Challenges include pacifist runs and 100% completion, but can also extend to things such as collecting special vehicles (some of which you weren't supposed to get), and using cheats to make the game harder.

Grand Theft Auto 3
Grand Theft Auto 3 challenges Include:
 * 100% Completion
 * Bulletproof/Special Cars
 * Custom Missions
 * Everyone Hates You/Everyone Has Weapons

Grand Theft Auto: Vice City
Grand Theft Auto: Vice City challenges Include:
 * 100% Completion
 * Bulletproof/Special Cars

Grand Theft Auto: San Andreas
Grand Theft Auto: San Andreas challenges Include:
 * 100% Completion
 * Bulletproof/Special Cars

Grand Theft Auto: Liberty City Stories
Grand Theft Auto: Liberty City Stories challenges Include:
 * 100% Completion
 * Bulletproof/Special Cars

Grand Theft Auto: Vice City Stories
Grand Theft Auto: Vice City Stories challenges Include:
 * 100% Completion
 * Bulletproof/Special Cars