It would have to be MW2 veteran (Goddamn favela and the riot police were very tough in the airport, good thing for the fact that you can skip it

) Uncharted 2, you die so very easily and the guardians are so difficult the first time you meet them. Fallout 3 was quite easy to get, use guides for bobble heads, and make one character and save at vital points for the "Raise an Evil, good, neutral, to level x" achievements. But the Spys 1000 saps was really difficult, and the worst one of all, was in assassins creed 2, I had 94% of them, and then my PS3 broke, and to get that last 6% i would have to start all over again, not cool, I had 68 feathers!
Also, almost every Disgaea 3 Achievement, 10 billion damage?! thats ridiculous, while if you have the time you can get over 3 trillion, it takes hundreds of hours, also, floors 1-100 in a land of carnage Item world, without a break. DOOD. BTW in the LOC every enemy is ridiculously overpowered and every one can one shot any character, so you have to hope they miss you, and you can rarely heal, and you cant save, its just unfair. Thank god I lent it to someone over the summer holidays, or I might become addicted.