Devil May Cry 4

Beat up to and including level 10 in Bloody Palace mode. To unlock Bloody Palace mode, beat the game on Devil Hunter difficulty. Do not quite the game, you need to die or finnish all 101 floors to get the achievement. Below are a list of the enemies from waves 1-10:

1 Scarecrow x 3
2 Scarecrow x 4
3 Scarecrow x 6
4 Frost x 2
5 Bianco Angelo x2
6 Mephisto x 3
7 Gladius x 6
8 Chimera Seed x 9
9 Chimera Seed x 9, Scarecrow x3
10 Scarecrow x 12

Start bloody palace with super dante on automatic mode. I would also reccomend to have all of his skills as well since it can make things a lot easier. Then when you are in game just turn your devil trigger on and lock-on on your enemy and spam Stinger (forward Y all time) and use shotgun on mephisto and faust (those witch like demons). Also I recommend you use trickster style all time. With that said you should finish all 101 stages in about 1 hour and 30 minutes.