Are my goals to fix my radix, nostrils, nose tip and philtrum achievable?

Actually, the images that you posted on Aug 22, 2019 show your nose even much better. They show a nose that is strong in its forward projection away from your face, and bringing the tip back closer to the face would be important as part of a rhinoplasty.Then, when a tip comes closer to the face, it usually makes the nose *look* as though the tip drooped, so it's often important to elevate the tip a bit as well.And then, as you mention, attention to the radix, which is important whenever the projection is being lessened.
How *much* to deproject or elevate the tip, or lower a bump on the bridge of the nose? We figure that out with morphs, well before surgery. I'd love for you to see some excellent professionally-designed morphs of what could possibly be done with your nose. Morphs could also help you identify what's bothering you, and help you set a goal for the rhinoplasty that's accurate for your tastes. Well-posed profile and three-quarter views would be particularly important in morphing your nose. (Side note: in my opinion, morphs should always be done by the surgeon, or he should direct an assistant as she makes the morphs. Morphs should be made with a constant eye to what actually *can* be done in surgery, for that particular nose, and only the surgeon has that information and judgment. Another aside: I also recommend that you not show morphs made by one surgeon to a different surgeon. If a surgeon makes his *own* morphs, you get to see whether he understands the important issues of your nose, and how your nose should be changed. But if you show the surgeon someone else's morphs, and he says "Of course I can make your nose look like that," then you don't really know if he fully understands, or even recognizes, the important changes shown in those morphs. And you don't know if he can make those changes during surgery.)
Remember that rhinoplasty is an exquisitely difficult operation to get right, and you should only have surgery if you are able to make yourself very confident in your surgeon's skills. The changes that your nose needs require advanced techniques, and skill that most plastic surgeons don't possess with expertise. For most noses, it's much better to not have surgery than to have inexpertly-performed surgery. Read my essay on how to stay out of trouble while selecting a rhinoplasty surgeon.  And it also discusses how to take photos that are best for online evaluations.
Your nose is also a perfect example of why computer imaging is mandatory in rhinoplasty. You need to know exactly what the surgeon is planning to accomplish -- what features he thinks he can change, and by how much he thinks he can change them. I always email morphs to my online rhinoplasty consultations. When you see the surgeon's goals in the morphs, you'll know whether he has an eye for an attractive nose, and whether he shares your opinion of what constitutes an attractive nose. You'll also know whether the changes he proposes are large enough to be meaningful to you, and whether he understands your wishes enough to address all of your priorities. How would you ever get that figured out without the morphs?And by the way, you do *not* have a microcephalic-type appearance to your forehead! You have absolutely gorgeous features. Forehead strength, jawline, chin, lips, cheekbones, eyebrow position, eyelids. My two cents.

From the photos, you certainly don't have a bad nose to begin with. However, many patients undergo rhinoplasty to simply make small changes. The changes you request seem reasonable and should be attainable. Be sure to see a rhinoplasty surgeon with a lot of experience that can do computer imaging for you at the same time.

You use a lot of specific terminology used by rhinoplasty surgeons. Hopefully that was obtained from several great rhinoplasty consults and not from looking it up on Google. Goals to accomplish during a  rhinoplasty are established during the consultation with your rhinoplasty surgeon. The actual physical exam of your nose is key in developing these goals that why ultimately you need a physical versus virtual rhinoplasty consult.