http://www.xbox360achievements.org/forum/showthread.php?t=13587

Evil Eye Gouger -- Screwdriver
Frenzied Fireman -- Fire Extinguisher
Insane Florist -- Hedge Cutters
King Of The Jungle -- Bowie Knife
Mad Butcher -- Meat Cleaver
Piano Man -- Fiber Wire
Slugger -- Baseball Bat ("A New Life" mission)
Sushi Chef -- Kitchen Knife
Swashbuckler -- Cane Sword

だそうな