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.
Fastest Time to Complete a Certain Task
Longest Time to Do a Certain Feat
Most Achievements of X in a Period of Time (for example: 30 seconds, 1 minute, 10 minutes)
Most Achievements of X under a Certain Condition
Most 35-Pound Curls While Performing A Suspended Split
Most Candy Bars Named In 30 Seconds While Being Tickled
Largest Group of People Achieving A Certain Task
Longest/Tallest/Shortest/Smallest/etc. Action or Object
Longest Operatic Cadenza
Social Media Records
Feats of Strength, Flexibility, or General Fitness
Body Tricks Records
Kitchen Sink Record
When a record setter grabs a bunch of items from around the house and incorporates them into a record with seemingly no purpose.
Extremely Specific Records
When a record setter creates very specific criteria that must be fulfilled in order to break the record.
Very Simple Records
When a record setter has a very simple (but not easy) record with that has very little specific criteria required to break the record.