First, I don't know why I'm posting since I require "moderator approval" and that normally takes 4-9 days so this thread will be dead by then...
Can confirm the "Sharpshooter Gold" achievement is broken, as others have stated.
I did want to mention a couple things about the tank unlocks, however.
Here are my stats so you believe I've unlocked these achievements.
As you can see, I have destroyed a tank at 1500+ meters and that's what I wanted to discuss.
A friend and I went on an empty Gumrak server about two months ago and he went to the northernmost border, and I went to the southernmost. FYI, the distance is about 2100 meters (confirmed with the kill message).
We were both in Teamspeak and one of us would fire until the other told us when we scored a hit. What's worth noting is that
from the shooters perspective "hits" almost always looked like misses. They either looked like they were waaaay over the top of the tank, or they fell short and you saw the splash in the snow. But then over Teamspeak you would hear "you hit my turret". There was no reliable way to tell if you actually hit the enemy tank. Also worth noting was that we were both completely stationary.
I'm afraid between floating tanks and rounds not landing where they appear we'll probably never have the same kind of long-range exchanges like in Ostfront's Black Day July or Debrecen, which is disappointing. But I haven't given up all hope just yet...