I can’t see if there’s a specific time for this, but while playing regular games, one of them will start with you speaking to a character called Magnum rather than the usual start. He’ll give you some tasks that are slightly different to usual, and Leviathan will give you slightly different enemies. Complete this mission and you’ll unlock this achievement, win or lose.
For me, this occurred when I was player level 13 and my analysis map was at 29%.