Originally Posted by Gunther Hermann
The silenced silverballer was one of the 1st pistols I collected (I did pick it up from the lawyer), and the all handguns achievement still didn't unlock once I'd unlocked/collected all of them.
i think the achievements are just glitchy. my melee one hasn't unlocked and there isn't any slots in the training room so i have no idea what has registered. so its just keep picking stuff up and hope for the best, unless a fix comes out.