Sparring with a Master
Not unlocked yetKill a Circus Gorefast with a Melee weapon.
Lifting a Dumbell
Not unlocked yetKill a Circus Husk with a LAW.
Ringmaster
Not unlocked yetKill the "Ring Leader" (Circus Patriarch)
The Big Hunt
Not unlocked yetKill a Circus Scrake with a Crossbow.
Fascist Dietitian
Not unlocked yetKill 200 Bloats.
Hot Cross Fun
Not unlocked yetKill 25 Burning Specimens with a Crossbow.
Experimenticenticide
Not unlocked yetKill 100 Specimens.
Experimentimillicide
Not unlocked yetKill 1,000 Specimens.
Experimentilottacide
Not unlocked yetKill 10,000 Specimens.
Dignity for the Dead
Not unlocked yetKill 10 Specimens Feeding on Dead Teammates Corpses.
Random Axe of Kindness
Not unlocked yetKill 15 Specimens with a Fire Axe in a Single Wave.
Social Outburst
Not unlocked yetKill 8 Specimens with One Grenade.
Highlander
Not unlocked yetKill a Scrake, a Fleshpound, and the Patriarch with the Claymore Sword within one map
Finish Him
Not unlocked yetHit a Scrake with the M203 Rifle grenade to kill him
Feeling Lucky?
Not unlocked yetKill a specimen with every shot from your Revolver for one magazine
Bitter Irony
Not unlocked yetKill 2 Scrakes with a Chainsaw in a Single Wave.
Homer's Heroes
Not unlocked yetKill 100 Sirens.
Keep Those Sneakers Off the Floor!
Not unlocked yetKill 20 Stalkers with Explosives.
Totally Metal
Not unlocked yetTransit - Kill 250 Zeds before completing the welding objective
Combat Medic
Not unlocked yetKill a zed that has injured a player (M7A3 rifle)
Single-Load Doom Bombardier
Not unlocked yetKill a ZED with a direct (unexploded) shot from the Orca Bomb Propeller or the M-79/M32
British Superiority
Not unlocked yetKill a zed each with both the Bullpup and FN-Fal
Cracked the Nutcracker!
Not unlocked yet[2010 Xmas] Land the killing blow on a Christmas Fleshpound with a Knife.
Dot of Doom
Not unlocked yetGet 25 headshots in a row with the EBR while using the Laser Sight.