If anyone is wondering how you do this:

For multiple objectives, just create new objectives but don't give them titles (use a space or else it won't show), then they will appear as a list of objectives. Enter a description and when you update that objective, the number will appear to the right of the description.

For timer object, you can only pass a number as a time in seconds, so I created a number object and a timer object. The timer loops every 1 second and triggers event 0. Then I have a script that triggers on event 0 and decreases the number object by 1. In the same script, I update the objective timer using the number object (not the timer object). The objective is shown with a timer like mm:ss. If the number used for the timer = 90, then the objective timer displays 1:30... and so forth.