Bobblehead questions.

[Duke Leto Atreides]

I'm missing one out of 20 and I have no idea which one it is. On a new game, will they all be back or only the missing one appears? If they are all in there again, do I only need to shoot the missing one only to get the reward? Must the game be completed after shooting the last bobblehead to get the reward?

[talgaby]

They respawn when you start a new game.
You can destroy only the one you missed, the bobblehead stat is accumulated on the save profile, not on a savegame.

The most common one people miss is the one sitting on top of the doorframe just as you exit the surveillance room of the barn, once you blow the wall and Lucas escapes. You need to turn back after getting your weapons back and shoot it.