Killing Floor

Transit - Get all Objective achievements AND beat KFO Transit on Hard or above to unlock Dr Rachel Clamely.

Transit - Destroy all the DNA vials

Transit - Pick up the door key

Transit - Kill 250 Zeds before completing the welding objective

Transit - Get the Nitro to the Objective in 135 seconds or less

Win a short round on KF-Hell playing as or with Harchier Spebbington

Beat Forgotten on Suicidal Difficulty

Beat Steamland in Objective Mode on Suicidal Difficulty

Kill 4 different types of Zeds with headshots with 4 shots from the Long Musket or the M14 without reloading

Beat Fright Yard on Hard Difficulty

Beat Fright Yard on Normal Difficulty

Get 4 of 6 of the 2013 Summer Event in-game level Achievements, one Standard and one Objective Mode map completion Achievement, plus the Punk'd Achievement to unlock Steampunk Mrs. Foster

Kill 5 zeds in ZED time without reloading with Dr. T's LDS or Bullpup

Kill a ZED with a direct (unexploded) shot from the Orca Bomb Propeller or the M-79/M32

Push a scrake back with the direct fire from a Hunting Shotgun or alt fire from the Multi-Chamber ZED Thrower

Get all 3 gold bars without the carriers taking damage while they have them

Beat Fright Yard on Hell on Earth Difficulty

Protect the ringmaster during the defense mission so that he does not get hit more than 15 times

[2013 Summer] Protect the Ringmaster during the escort mission so that he does not get hit more than 15 times

Have 5 Breaker Boxes 100% repaired at the same time

[2013 Summer] Complete the Pop the Clot, the Strong Man and the Grenade Toss games

[2013 Summer] Destroy all the Pukey the Clown dolls

Beat Steamland in Objective Mode on Hell on Earth Difficulty

Beat Fright Yard on Suicidal Difficulty

Beat Fright Yard in Objective Mode on Normal Difficulty

Beat Forgotten on Hard Difficulty

Use Bile or the Flamethrower to kill one of each Halloween Zed

Beat Forgotten on Normal Difficulty

Beat Hell on Hell on Earth Difficulty

Beat Hell on Suicidal Difficulty

Beat Hell on Hard Difficulty

Beat Hell on Normal Difficulty

Kill 10 Halloween zeds in explosions using the Seeker 6 or the M32 within 5 seconds

Kill a Halloween Fleshpound and Scrake in the same explosion with the Seal Squeal Harpoon Bomber or the LAW

Beat Fright Yard in Objective Mode on Hard Difficulty

Destroy all 30 Cameras

Win Fuel on the first try

Collect all the bile without a contamination

Attach the crane hook within 125 seconds

Beat Fright Yard in Objective Mode on Hell on Earth Difficulty

Beat Fright Yard in Objective Mode on Suicidal Difficulty

Kill 2 Circus Stalkers with a Melee weapon to the back in one wave.

Kill the "Ring Leader" (Circus Patriarch)

Win a Long Game on Manor on Normal Difficulty.

Complete a Long Game on all 3 Summer 2009 maps on Normal Difficulty.

Win a Long Game on Manor on Suicidal Difficulty.

Win a Long Game on Farm on Suicidal Difficulty.

Win a Long Game on Offices on Suicidal Difficulty.

Win a Long Game on Biotics Lab on Suicidal Difficulty.

Complete a Long Game on all 5 Core Maps on Suicidal Difficulty.