About broken/unobtainable achievements

Achievements aren't and never were a criterion for me whether to buy a game or not, and I normally don't care about them.
However, in some games I like hunting achievements - as long as they're obtainable within and within only the game itself (no 3rd party programs, no weird achievements that force you to play with a specific player/dev or something like that etc.) - but I feel like some devs often don't get the balance right regarding how many and how grindy they should be; for instance, getting an achievement every 5 minutes feels kinda redundant and having to grind thing X for a zillion times makes me not wanna bother with them at all. Almost unobtainable ones can be funny sometimes though, however if they're simply broken or unrealizable at all, it tends to be a warning sign for me that the dev might not really care about the game/consumer and thus making me check twice for any other bugs (possibly game-breaking ones) or shenanigans beforehand. Achievements in general can also pose a distraction to the game's story and full enjoyment for me, so the right balancing is therefore of even greater importance IMO. Still, there's a lot of (mainly older) games with no achievements or trading cards that are more than enjoyable, so for me they're merely the icing on top instead of a general necessity, if any.

I'm not usually concerned about achievements at all, but winning a game with broken achievements bothers me because I worry that the person who gave it might think I didn't even bother playing (playtime isn't really an indicator in the age of card farming).

1) No, actually I don´t care, if game has broken achievements or not. I will find out when I can´t get it during playing. It get me a bit sad, but nothing I can do.
2) I would like to see some tracking in game achievement page instead of checking hunter sites or game forum to find out.
3) Well I prefer to play achievement game - it keeps me in game, because I can show I did that or that in-game, but well there is plenty of games I can play even without achievements. But still my library is categorized in 2 main categories (achievements/no achievements).

And well it is hard to say something about games with lot of useless achievements. Sometimes game can be fun and I am happy to play it, but these nonesense achievements ruins fun a lot (like The First Spark madness). I got all achievements, but still I am not proud of it as I would be with only level achievements.

Firstly about the issue of games with no achievements, on my most played games list not only on Steam there are various games which have (or had) no achievements. E.g. with around 100 hours played each on TrackMania2 Stadium and Kerbal Space Program, they have no achievements to this day and I still like to play them now and then. So to me not as if a prime directive to play games for sake of chasing achievements.

Nevertheless, I also find that achievements can make a game experience more interesting, such as in terms of more play-time (e.g. in BioShock Remastered having completed the story I may perhaps not have noticed there are also challenge levels if it were not for them coming with achievements) or in terms of seeing on glance which games are done with once 100% and often no mod to try out or no MP-aspect about it. And that is quite why I signed up on Astats as it has quite nice features, such as lists of owned games sorted by achievement percentage had or by play-time, and more. Which in turn did get me more interested in the whole 100% chasing thing.

And that brings me to the first two questions. Yeah, if looking at bundles these days, some games may be somewhat meh, but if they have functioning achievements I may be more interested to purchase the bundle and play them as well besides any game that looks anyhow interesting, especially if the achievements show that there is quite some content in the game when the achievements aren't all as if +1 button pushed. And I find that rather interesting than the whole trading card issue since the trading card aspect seems to cause way more not really any game whatsoever to be sold as if a video game and I sure do not mean to be one of those who support both in purchase and often market fee those putting up as if a tech demo and expecting persons to pay sometimes even around $10 full price for something which is technically nothing (such as case of someone using an Unity asset to sell it as if game and apparently having made thousands of dollars just in trading card fee sales).

I actually prefer if a game has no (or just progress) achievements nowadays. They were fun for a couple of years, but I care way less now (Especially with all the games that have hundreds of "achievements", that all the garbage collectors jump on to show off on their profile). So it doesn't really bother me when I come across a broken/unobtainable achievement.