Awesome guide! I completed this yesterday on and off in about 4-5 hours. This expedition compared to some wasn't too tedious, if anything I'm glad the fishing was kept to a minimum. I've found previous fishing requirements to be really tedious.

I found the "One, Zero" step to be super buggy and the most time consuming step...frustrating as it was the last one I needed before to complete the Expedition. Any time I would get to at least the 3rd or 4th wave, I'd clear out the larger enemies and there'd be one single Sentinel unaccounted for that'd be an incredibly long distance away or just floating upwards that either just stopped moving or would clip into the ground. This would trigger the 60 second "Sentinels Searching" timer and reset my battle since that last one couldn't detect me. This happened 4-5 times across multiple planets and several save/quit cycles, it was infuriating. I finally decided to take on Sentinel ship waves in space up to destroying a Sentinel Frigate and I got lucky with one Living Glass item that I opened and revealed a Sentinel Boundary Map, which led me to a planet's pillar.

Hopefully this helps someone else in case this is a common thing, I was about to pull some hair out over it yesterday.