So first of all, there are still people out there not sure if this title actually exists, or if it is just an elaborate gaslight by the community. It wouldn't be the first time. So:

Its set on my account for anyone who wants to check, and doesn't know someone who has it. Photoshop skills aside, this can be verified in-game.
Second: how long did it take me to get it? Approximately 16500 openings across about five hours between Saturday and Sunday.
The maximum sustainable opening rate I was able to measure was about 1.5 openings per second, or slightly more than 5000 openings per hour. As a practical matter, no matter how fast you are, the servers aren't able to process crystal openings faster than that. In practice I was averaging between about one and about one and a half per second, or between 3000 and 5500 per hour.
How many openings does it take? It appears to be a random drop, which means it will take everyone differing random amounts. There's no posted odds, but we do have this:

If we trust this (and it might just be an exaggeration) that implies a one in a hundred thousand drop rate, which is far lower than any drop rate for anything I'm aware of ever being set in a crystal. This would be essentially impossible to confirm with testing, as there's no way we'll get a large enough set of reliable testers willing to go that high. However, based on the very limited anecdotes I've heard regarding when players are, and equally important are not getting the title, it is reasonable to guess the drop odds is probably worse than one in ten thousand. I would guess the odds are very likely to be somewhere between one in twenty thousand and one in a hundred thousand, and the 99.999% figure could conceivably be accurate. If you really, really want the title be prepared to potentially open the crystal a hundred thousand times or more. Even at the more probable end of the range, it would still be possible to require several times the average amount.
If the odds are in fact one in a hundred thousand, I had about a 15% chance to pull the title within the openings I did. Lucky, but not extraordinarily so. If the odds are closer to one in twenty thousand, then I had about a 56% chance of pulling the title within the openings I did, which is statistically close to average.
Mechanically, the title awards as a selector that should pop onto the screen. When it appeared for me, it immediately bounced me out of the crystal opening screen and did not return to it, which means the only way to know how many crystals you opened up to the point of getting the title is from memory. Also,
the crystal does not seem to drop both another crystal and the title. That means when you get the title, you will no longer have another infinity crystal to open. Short of a glitch, it is either or.
So the choice is: trade for the trade-in title, push to get the Proud and Accomplished title, or keep the crystal. As far as I'm aware, at the moment you can only have one of those, so choose carefully.