My sin is that I used sv_cheats 1 in a Map Labs competition in order to make the player to not take damage when they fall on a pile of trash since I didn't found other alternatives to make the player to not take damage, now most of people won't get the achievement on my map because I'm an evil basterd.
Second sin is that I carved and I also made a inside-out brush that I'm proud of but would fuck up my map.