You may be asked to retake a screenshot if it does not meet all the requirements. If the required elements are spread between multiple screenshots it will also be accepted.
Just wanted to jump on this one right here… If the following elements are not
contained within the same image, then the kill time cannot be considered verified: local time (either via computer overlay or game clock), UTC time, and achievement time. All three elements must be visible simultaneously
, otherwise kill time can be trivially falsified. And by "trivially falsified" I mean "without photoshop". Guild name is basically the only element which could be spread into a second image without affecting verification trustworthiness.
Edit: Snap! I read the final paragraph after writing my reply. Will shoot you a PM and remove this post if you desire.