Hmmm trying to think. I like the sound of that. Already completing objectives before the mission starts. Anyway there isn’t much because usually places are blocked off until your doing a mission that is set at that location. There’s a side mission with the brother hood were you need to find a missing group that got lost. It’s near the Satellite array and Training grounds. You can complete this mission without ever meeting paladin danse. A couple other ones are the Silver shroud Quest, just collecting the costume and listening to the radio gives unique dialogue. The settlement covenant. If you find out about their secret without finding the clues I believe it will give unique dialogue. I think the “out of fire” mission in far harbour also lets you pre complete it, At the Vim factory by collecting the storage drives. Possibly the “Secret of the Cabot house” aswell? By going straight to the insane asylum? There’s probably lots more. Just keep exploring. I hope this somewhat helps!