Just posting a quick update to this thread, since I have gone through with the transfer since posting it. All of my seasonal scores reset with the transfer, but all of my accumulated scores transferred with me. That also means all of my achievement progress towards the Pteranodon Horn was fully retained, thankfully. I transferred from Exodus on the Primal data center to Mateus on the Crystal data center, so at the very least, I can confirm that transferring to another server on a different data center in your region *does not* cause you to lose accumulated score or achievement progress. It *does*, however, reset your seasonal score, so be aware of that if you are concerned with any current season scores.