Don’t listen to this, it’s only true for the boulder badge.
You can either do like @buckna suggested and use the route via smpratte’s patreon. Honestly though, most members consider this cheating because you haven’t really earned your badges.
The second way to get the badges is to contact the mods and they’ll make you perform certain “tasks”. Some mods are nice and the tasks are easy; like for the boulder badge you only need to make 10 posts. You don’t even have to contact the mod because he’s tired of all the new accounts that want to win badges.
The tasks only gets worse though, and that’s why most only have a few badges.
@cullers explained it very well in this thread