There is a trophy for Payday: The Heist called Federal Crime. The trophy description is:
Defeat 25 FBI agents in a row.
I am wondering if I need to get all 25 kills in one game or can I kill 15 agents in a row in one game and then 10 in a row at the start of another.
The in-game challenge section for it does not show a progress bar (which makes me think it might need to be all in one map) but since I can't check the progress I don't know if I don't have it because I accidentally killed someone else or if it needs to be done all in one game.