Unreal Tournament III

The "Biohazard" award is earned for getting 15 kills with the Bio Rifle in a single match.

Suggested Setup
Gametype: Deathmatch
Map: Rising Sun
Mutators: Speed Freak, Weapon Replacement (All to Impact Hammer)

Sadly, the Bio Rifle can't be chosen with the Weapon Replacement mutator. The next best thing is to play on Rising Sun, which has a Bio Rifle spawn in an easy to remember location that turns into a massive choke point because the bots all like to try running to get the Bio Rifle or the torso armor that spawns inside the building right beside the Bio Rifle. When the match starts simply run over and grab the Bio Rifle, then back away and start shooting at all the enemies that start running in. Since the Bio Rifle has limited ammo you'll most likely have to run in the fray to try and snag dropped weapons. You'll most likely die more in this match than when going for any of the other weapon trophies. Simply play the match to 15 (or as suggested 20 if you are doing this at the same time as Get a Life) then keep playing matches until you get the trophy.

For each of the remaining weapon related trophies all matches should be played to 20, then after 10 matches are played switch the date forward once so that the next weapon can count for another day.