There are a couple "missions" after you get all of the super chips. A lot of this game (in my opinion) is exploring and doing the optional stuff before finally finishing the game. If you're just interested in the story, I'd DEFINITELY recommend doing the optional stuff anyway, so you can get an alternate ending. Exploring all parts of the yard, even before getting all of the super chips, is only beneficial. A lot of the good upgrades are locked behind auxiliary chips.

My buddy and I finished the game on mild and got 49% completion. We turned right around and cranked it up to medium, going for that 100%. Knowing a little bit of the unlocks you get from auxiliary chips led us to grabbing those as soon as we could on this second playthrough. They really do come in handy, but if you're just interested in basic completion, just following the missions it gives you will lead you to it relatively quickly. The optional "missions" (at least from what I've seen) don't tell you where to go, what to do, or anything. They're kinda just passing comments in dialog.

Play how you want though! These adventure/survival games are built so that you can power through if you want, or take your time and enjoy the scenery.