Biohazard Trophy in Blacklight: Retribution
Played 20 Matches of Onslaught
How to unlock Biohazard
To get this trophy more quickly, go: Play Game => Choose Playlist, then untick every box except the one that says "Onslaught". Now press to initiate a search with your custom filters. If you manage to find a decently active server, use it to your advantage and stick with it until the trophy pops. If the search fails to find a server, either come back later or invite a friend to help you out.
"Onslaught" is Blacklight: Retribution's equivalent of Call of Duty Zombies, only without the convoluted Easter Eggs and level designs. You have to survive all 10 rounds for the match to count as successfully completed (see To the Bitter End for a brief walkthrough). It doesn't matter if you win or lose, the trophy will pop after you have played 20 matches of Kill Confirmed.