Left 4 Dead Achievement generator.
 

Big thanks to my little brother for finding this gem over on Zero Punctuation forums. Some very funny stuff in that thread.
http://www.escapistmagazine.com/forums/read/9.89315 - Warning launguage and other content inappropriate for kiddies

Anyway to the point. http://l4d-fr.com/achievements.php?eng
Create your own achievements for L4D!

http://l4d-fr.com/ach.php?a=HEADACHE&b=Headshot a tank, then get knocked down&c=u&e=35&f=2

Cute but you should flag the escapist link as having foul language and sexual references.