I've painted myself into a corner and am forced to choose between abandoning a couple hours' progress or cheating my way out of it. Unfortunately, I can't find hard data how if/how the use of console command affects the unlocking of Steam achievements.

I've heard a few conflicting theories and can think of a couple more:

1. I have heard that using any console command, ever, permanently prevents that/all characters from unlocking achievements.
2. I have heard that using any console command prevents you from unlocking any achievements for that "session" (variously, until you load a save or restart the game).
3. It seems reasonable that certain console commands (such as tgm — Toggle God Mode) might prevent the unlocking of achievements while active and/or others (such as directly manipulating skills/perks/etc.) permanently block achievements for that character once used.
4. It also seems possble that console commands have no effect on achievements whatsover (at least, I have not yet seen evidence to the contrary).

Do we have any hard info on this? Official sources, original research, anything?