Breathe! There's very little you absolutely need! Food, something for baby to wear, something for baby to sleep in, something to transport baby in.
What you need will be determined by your lifestyle -- for example, we lived in central London and didn't have a car, so didn't buy a car seat, and the fact that we were continually getting on and off public transport with a pushchair and lived up a flight of steps meant we needed the lightest possible one that could be used from newborn.
I'd intended to breastfeed, but that didn't work, so when I came home from hospital with DS, DH ran out and bought bottles, steriliser etc. We'd bought a well-regarded sling before he was born, too, but I had a CS and the scar got infected, so it was too painful to sling for a while, and in fact I used it less than I planned.
We had a sidelong cot, because DS would be sleeping in our room, and a Moses basket.
He didn't have a separate room, so no separate furniture other than a cot. We just changed him on our bed. Only bought a high chair when he was older, a TrippTrapp which he used until he was big enough to use a normal chair.
What I'm saying is that there's no 'standard' list of absolute needs. And there's very little that can't be bought on the fly after the baby arrives.