You need to go to your boss and sell him on the idea of why it is so important that the top few things you have identified can’t fail. You need to get him as committed as you are to deliver on these few things. You need to inspire him with your plan to overachieve on them and why it matters. Once you do that, you can show him the rest of the list and get his agreement to support you if those less-critical things get done more slowly or at a lower level of excellence.