I've written several messages on acronis's site and to tech support. They don't answer. And I have their tech support for several months. I also have threads on several forums. The problem proved to be complex. Maybe because GPT and EFI are still fresh concepts and everyone's still thinking in terms of MBR.
I thought I had logs to understand what happened but it seems that operation was not logged.
The next step is to try load windows with edited bcd because right now it does not load and it has no such mode as grub rescue to point to correct partition.
>It is possible that Acronis did something to filesystem on ESP
Quite possible. It was a surprise for me when I chose to resize adjacent
partitions and acronis decided to move around some stuff. I should have made a photo of the error then. I thought it works like transactional database and does not break anything. I was wrong - it broke NTFS on my windows D:. I could not recover MFT (Master File Table with files locations) and did quick format as last cause. There is no valuable data, just a lot of installed programs. Also hoping chkdsk /f might add missing files back to MFT.
Thanks, you've helped a lot with my understanding of the problem. I will write once this is solved.