Here is a list of the general categories of world records. You can always create a new kind of record, as long as it is quantifiable, breakable, and legal. This list is by no means definitive, it should just give you some idea of the directions world record setters take.

Most Achievements of X in a Period of Time (for example: 30 seconds, 1 minute, 10 minutes)

When a record setter grabs a bunch of items from around the house and incorporates them into a record with seemingly no purpose.

When a record setter creates very specific criteria that must be fulfilled in order to break the record. 

When a record setter has a very simple (but not easy) record with that has very little specific criteria required to break the record.