Talk about a tough challenge with very little reward. The '50x Combo' achievement in Batman: Arkham City is hard to get. Like, stupidly hard. What you have to do to get this achievement is get a 50x combo without taking any damaged.
Yeah, it's hard.
The best way to do this is to load up a challenge room and go to town on the thugs. The level "Survival of the Fittest" works really well, by the way. Then, just start wailing away. Check out the video for a great example of this.
- Xbox 360: 5G
- PlayStation 3: Bronze trophy