Ok so people can still farm impossible achievements, if they cant seem to randomly get an item.
The achievements are far from impossible. I easily managed to get all three Sniper milestones in the space of two or three nights of playing, and I got two of the Spy milestones in a single night of playing and I'm a terrible spy. This was on a regular server during regular play, not on an achievement farming server.
EDIT:
In answer to Kantham's question, yes I randomly got the Fedora for the Spy. So I felt compelled to play Spy at least occasionally.
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