DLC: Gun Sonata

Last Blood (30G)
At the end of Guns of Stygia, kill all the enemies on the walkways before the explosions do

Hell Razor (25G)
Kill a Burnout using the helicopter that arrives in Crash Site

Heart Attack (40G)
Kill a Boss using the Hot Dog cart in the Hotel Elysium map

Bell End (10G)
Kill 5 enemies at the same time using "Dung" in the Villa map

Extinguisher (20G)
In the Sewer map Kill 5 enemies in 1 wave by setting them on fire then extinguishing them