If you had simply googled "FPGA motor control" you would have found a vast amount help on this issue. Altera, for example, has a number of reference designs and IP to avoid reinventing the wheel. There are many devel boards usable for motor control. Get one and do a simple two axis design first (after figuring out how to make LED's blink). Your specs are far to vague for anyone to help you and once you firm them up, you can read the FPGA spec sheets as easily as anyone.
https://www.altera.com/solutions/industry/industrial/applications/automation/motor-control.html (
https://www.altera.com/solutions/industry/industrial/applications/automation/motor-control.html)
I can almost guarantee you're going to have to prioritize your requirements and give up some things. Non-BGA (why?) and -55C? Unless your launching it into space, those may be the first that have to go.