What are all the different possible shoulder injuries?

Shoulder injuries: The most common shoulder injuries are rotator cuff tears, dislocations, and fractures.

Quite a few: They can range from relatively minor to quite serious. Inflammation causing bursitis or tendinitis of the rotator cuff, sprains of the rotator cuff or ac joint, tears of the rotator cuff or cartilage around the socket called the labrum resulting in pain, weakness and/or instability, biceps tendinitis or tears, fractures of the humerus or collar-bone or shoulder blade, or nerve injuries.

Many: That is too general of a question. You may wish to consult a textbook.