What are three accomplishments that you as a Russian patriot, are most proud of?
I'll try to put aside the preposterous premise of your question and try to answer it objectively.
First and foremost, I'm most proud of our soldiers. Operating in a one-sided information war, where they are forbidden from carrying phones and recording devices by law, while the Ukrainians daily flood the airwaves with photos of burnt armor and mangled corpses - could not have been easy. The collective Western world has been pouring **** on them, and the military at large, for the past two months. Top officials and their parroting populations using epithets like "incompetent", "paper tiger", etc. This, should be demoralizing. Yet, despite all this they continue to do their job methodically and effectively. Now all that's left for the West to do is endlessly opine about how Russia "inexplicably" did not manage to end the war in under a week.
Second, in what is likely the most extreme battlefield environment in recent history, Russian soldiers are fighting against the weapons of the collective West. No armed conflict in our lifetime involved such a saturation of weapons provided by outsiders over such a short period of time. Already, Ukrainians have something like 10x ATGMs for every Russian tank. What's more, America provides them with real time targeting information, leading to the deaths of Russian generals and the sinking of warships, for example. It provides real time intelligence on inbound strikes, and advises them on an operational and strategic level. Despite all this, Russian soldiers continue to advance, occupying a territory now roughly the size of England. One cannot help but feel proud when you are making gains in the face of such odds.
This is why it makes me chuckle when I read the cute messages from Germans and Poles here about "what a revelation it has been to see Russia's inferior military quality". This coming from a country that just gave away nearly all of its tanks in one small shipment, and one month ago was afraid to hand over a dozen Migs lest it's sky be undefended (Poland). Germany, though more humble, should also stay silent - since this conflict has revealed that Germany is de facto a militarily impotent. Rolling over a Germany or a Poland, sans an American nuclear umbrella, would be an infinitely easier proposition than fighting Ukraine in the current state. So yes, it's wise policy on your part to help them as best you can and no use pretending you are doing it for unselfish reasons.