5. GTA IV - Key to the City (100g/Gold Trophy): Achieve 100% in Game Progress Statistic
GTA IVs 100% completion achievement will take you a while. The story missions, which make up 60%, are by far the easiest task. Youve also got to complete all main character side missions, all random character encounters, all car thefts, all vigilante missions, every stunt jump and kill all two hundred pigeons dotted around Liberty City; youve also got to make most of your friends like you beyond a certain per cent. Its not the most impossible achievement in terms of sheer difficulty. But it will add around 50 60 hours on top of your normal gaming experience, which will already have racked up to a good 30 - 40, leaving your total play time easily beyond the 100 hour mark. Making this one only for the most dedicated of GTA players.