I just got a message saying "You've earned the Raffle Winner! achievement"

What raffle? Huh? I don't remember entering any raffles...Did I win anything? Is there something I should collect somewhere? I am very confused.

Everytime you post here on the forums, it is possible that you might find a Raffle Ticket (Forum Ticket) on the forums. When you find a Raffle Ticket, then you can get the Raffle Winner! achievement. There are different tiers for it (1, 5, 10, 25).

Ah, okay! Little confusing that they call it a raffle.

Yeah, it is confusing. Has to do with the history of the site, old currencies, removing old currencies, changes in how you acquire things (the original forum tickets didn't exist as they do now and they repurposed things). Some things got renamed, but they forgot about others - so you end up with some weird mishmash that no one quite remembers how it got that way. But raffle tickets, forum tickets and forum points are all the same thing and can be spent in the Forum Shop. Not to be confused with Forum Boxes, which are a different thing...LOL.