Run The Pit in 'S.S.D.D.' and finish with a final time under 30 seconds.

Remember that a bullet can pass through a target and hit whatever is on the other side.
This means that you can accidentally shoot a civilian, however, you can use it to your advantage, as there are a few instances where 2 targets can be hit with 1 bullet.
With this in mind, after you complete your first run through, there are more weapons you can choose from, including a 2nd pistol.



Achievement is worth 10 gamerscore.