Polovision

This is awarded after you first check in to any venue.

This is awarded after you’ve checked in to 10 distinct venues (i.e. the same venue multiple times doesn’t count).

As Adventurer, but for 25 unique venues.

As Adventurer, but for 50 unique venues.

This is awarded after you check in 30 times within a month. (Edit: Confirmed. This badge is for any 30-day timespan, not a particular calendar month.)

Also, this badge has nothing to do with being given superuser status to edit venues.

Also also, due to the bronze colour of this badge, and the fact that the Adventurer, Explorer, Superstar badges follow a bronze, silver, gold sequence, I suspect there may be more in this theme for even more check-ins in a month, but I wasn’t able to find any. Any confirmation would be great!

Check in on four consecutive nights. (No need for sexual deviation, or becoming an alcoholic robot, thankfully!)

Check in to four venues in one night.

Check in to the same venue three times in one week (again, I assume this means any 7-day span, rather than a calendar week). This badge made more sense when the badges were awarded for specific cities (so you would get duplicate badges when in other cities), but now that Foursquare has become unrestrained by location, it’s a lot less significant.

Check in after 3am  on any weekday morning. Obviously, you can also get this by checking in very early, but I don’t know what kind of time. I’d guess before around 6am. Again, any confirmation would be great.

Check in ten times in a 12-hour span. Also: do us all a favour and don’t auto-tweet those check-ins. Cheers.

To be a mayor, you have to have checked in to a venue more than any other person (and have to have checked in at least twice). This badge is awarded when you are mayor of ten different venues at once.

Check in to a venue that has had recent check-ins from three other Foursquare users of the opposite sex.

Check in to a venue that 10 of your Foursquare friends are checked in to.

Check in to a venue that another 50 people are checked in to.

Check in to a venue that another 250 people are checked in to. The description I’ve given here implies you’re at SXSW, where it was first rolled out. It might have a more generic message now that you can get it anywhere.

(Updated 13/08/10) I recently got this one, so I can tell you how. I got it by shouting “Happy Birthday <name>!” while checking in 5 times. I understand that only the last shout actually has to be with a check-in, but apart from that, normal shouts count too. I don’t know if it works when there isn’t a name, or without an exclamation mark etc.

Shout “Happy Foursquare Day” on April 16th.

This less-than-desirable badge is awarded when you check in to venues tagged with “douchebags”. Beyond that, I have no details. Not sure how many, or how quickly, or whether they have to be unique venues or not.

Check in three times to venues tagged with “photobooth”.

Check in five times to venues tagged with “airport”.

Check in to three venues tagged with “karaoke” in a month (presumably any 30-day timespan).

Check in to a venue tagged with “boat”.

Check in to venues tagged with “gym” ten times in a 30-day timespan.

Check in ten times to venues tagged with “movies”. Might also allow “film” or “cinema” for those of us not from America? Maybe that’s just optimistic of me.

Check in ten times to venues tagged with “playground”.

Check in three times to venues tagged with “apple store” (or possibly just “apple”?).

Check in to 5 Starbuck’s venues. (Not sure if they must be tagged “Starbuck’s” or called “Starbuck’s” or what.)

Check in to 10 venues tagged with “gallery”.

Check in to 20 (different?) venues tagged with “pizza”.