Here are the three areas:
http://kf-wiki.com/wiki/Achievements#Ha ... en_2011.29
http://kf-wiki.com/wiki/Achievements#Hi ... orror_2012
http://kf-wiki.com/wiki/Achievements#Hi ... en_2013.29
Also the Potatoe Fools Achievments are available as well.
http://kf-wiki.com/wiki/Achievements#Po ... 1_.26_2012
The new achievements Bier refereed to are here:
Candelstine skulls are only here for this one event to be unlocked. There are videos on youtube.
Regarding some achievements-
*Some require DLCs.
*777 fuel can be easilly aquired on this map:
https://steamcommunity.com/linkfilter/? ... ms/1lS52HO
Simply download the map called 777v2 and place it in killing floor. Restart the game in solo to continue heading to the fuel pump and insert money. This goes for the 777 achievement in the 2013 achievements.
777 was the hardest for me after spending 10 minutes restarting the map >.> I would not recommend playing KF Objective that many times (probably would be hours of restarting KFO Freight Yard).
Have fun and Happy Halloween :p