Just wondering

You get points for milestones of your membership of the site. Things like your first post, having been here a year etc. I can't remember specifics at the moment but yesterday I got 12 trophies all at once. I think the software was catching up.

EDIT: Click on the number 3 below your avatar.

They are awarded based on your contribution to the forum, say once you've reached a 100 posts or have been a member for one year you get a trophy awarded.