At the beginning of the movie, there is a large scene where Holmes and Watson fight through several of Black's men.
Holmes goes through carefully explained thoughts on how he will take down men on several occasions, dislocations of various joints (jaws, knees, shoulders, elbows) and shows the breaking of several legs and ribs as they are hit in slow motion. Some sound effects follow the impacts (a crunch, etc.)
Holmes and Watson are stumbled upon and get in many fights throughout, which are bloodless and usually silent except for grunts and music. In short, there is no sound of bones breaking or things like that. Usually.
A character uses a cattle prod to violently shock a man in three occasions. Although he does not die. This scene is somewhat comedic.
Holmes is hit in the legs and appears to be run over by a boat.
Pig carcasses are cut in half by a large saw, there is no gore, but we see the carcasses get sliced and see pieces of raw, sometimes bloody meat lying on the floor. An imprisoned Irene Adler is put on the conveyor which is sawing pig carcasses but is not harmed. This scene is intense.
Bloody animal parts are tossed into a machine's mechanism.
A man cuts off a dead rat's tail for a science experiment.
Several men are shot.
An explosion harms several important characters. The scene is drawn out in slow motion.
A man drowns in a bathtub. No nudity from the chest down.
A man bursts into flames and falls out a three-story window.
There are two hanging scenes, one is a casual way of killing a prisoner on death row, while the other very violent.
A woman falls off a bridge and appears to die.
Many times Holmes will find himself dodging blows from things such as a hammer wielded by a large man, these scenes may get intense.