Can I compost...
Tissues?
Maybe.
As long as it’s not been used to clean up anything yacky or on the “no” list, you can compost it.
Best avoiding anything you’ve used for your own, um, mucus leaks (in case the pathogens which carry disease are not all destroyed by the composting process) but if you’ve not used it for that, or to clean up cooked food messes, pet waste, dairy spills, oil spills, or used it in connection with chemical cleaners etc, you should be ok.
In category Household waste