Some more specific thoughts I have, beyond how bland a lot of these are, and the fact that they would be imporoved, IMO, but ditching double proficiency and structuring the feats more like Athelete.
Arcanist: You have to be kidding me. Literally just look at what Arcana does in 4e, and you get more interesting things than Prestidigitation and Detect Magic.
Naturalist: I'd rather not have spells be the benefits to these skills. Even if you are mimicking spell effects as semi-mundane effects, Nature doesn't need to be a magical skill, as such, and even if it is, the magic skills should work differently than spells. Give it ritual-style benefits. These feats are just...filler, IMO. they had a few good ideas, and wanted to do one article. Hopefully the feedback we provide gives them some better ideas for revision on the boring feats.
Silver-Tongued and Menacing: Why not just make it a bonus action? Bonus action or as part of attack action? The idea is obviously to benefit those who get extra attack, and let them use one attack to do this, while the other is an attack, and then out of combat they can use the abilities like normal. But it would be clearer if it was a bonus action, IMO, and make a rather small difference in power. This is a good case for having multiple benefits instead of double proficiency, as well. These could improve with level! "At or before level 4, you gain [benefit]. At level 6, you gain [other benefit]."
As they stand, though, they work fine and will add to the game without raising the general power level. These aren't more powerful than other feats.
Survivalist. <heavy sigh> This is the most boring feat in the game. I can't even fathom wanting this feat, ever.
The rest I like, and I think with some feedback and revision, the next iteration of this could be really, really good.