The personal statement (unless otherwise directed) should be about you - who you are, where you're coming from, where you're going and why; a reflection on your personal background, achievements, motivation for studying law and/or long term goals - not just a static list.
Concentrate more on actual experiences rather than speculation about future accomplishments. Take an inventory of your accomplishments before writing. Be selective and choose to discuss the things that are the most interesting and make you stand out.
Try to choose a theme rather than random thoughts. Remember, your job is to sell yourself. Many schools request a resume which will provide them with a list of accomplishments. Your personal statement is an opportunity to provide additional, more in-depth information. Law schools are looking for a diverse group of students who can contribute a variety of skills, backgrounds and ideas to the class and to the profession.
The essay is also a sample of your writing skills and should be written very clearly and concisely, generally not more than 2 or 3 pages, but read the instructions. It must contain NO spelling or grammar errors. PROOFREAD, PROOFREAD, PROOFREAD!
If you have any concerns about your grades, or LSAT score that require an explanation, do it briefly and not defensively. Unless the school specifically instructs you to include these explanations in your personal statement, you should address this kind of issue on a separate addendum.