Yeah, I think if you pay attention you can do it in a single playthrough, I went through blind the first time and didn’t start paying attention to guides until post game, so I’d missed a couple side quests and trophies. And then even paying attention on NG+ I missed one, so here I am at three playthroughs waiting for DLC.
1% is a pretty normal amount for an urban area, but it’s usually a combination of county and city. If the state of Texas has a 1% tax on top of county and city taxes, that’d be pretty high.