Recently, while getting the Bartender technique, I discovered a way to score more points on the Hitman Campaign level Welcome To Hope.
If you take a bottle and hit anyone from behind them (I've only tried in the bar fight) , you should get a 'Silent Kill' score bonus.
Unfortunately the bottle breaks after using it but there are many bottles in the level. I haven't tried using all of them yet but achieved Shadow on the level.
Could it be possible to achieve Silent Assassin?
People have likely discovered this before but I'm unsure if it's been shared on the forums yet.
Have fun smashing bottles into people :)