Ok, this is really ♥♥♥♥♥♥♥ me off and I really need an answer for me before I crack my laptop and start slaughter myself again.
I have done all campaign on easy, normal levels and I tried expert on Dead Center, Dark Carnival and Swamp thingy map, and after spent 10 hours total for all 3 of them, tried 56 times 9(total tries), reach the ending scene, and I GOT NO ACHIEVEMENT COUNT FOR PLAYING IT!
I need an answer about this, why the achievement doesn't count after I finish an campaign on expert (note I started expert in very first map, with no cheat aka. counsole command)
Is this mean i also have to play advance for all of them first then do expert? if that's the case, this game sucks.