Well there is a couple more issues
In the google docs the point count gets messy in the 3rd part, the only real issue it causes is that you cannot get Xelpud's random set C dialog where it is pointed out, fortunately you can delay that to the start of the last part (right after you get the Mulana talisman).
The other issue is that you're missing a handful of dialog with Xelpufd relating to entering hte tent with items, the pochette key, vessel and the Mulana talisman namely, the Mulana talisman is actually helpful in that case, what you have to do is get random set C after getting it (since you're sitting at 152 points instead of 150) then get the talisman dialogs (there's 2) which will reset your point to 150, aterwards you can follow the guide as normal and once you get back up to the part where it says to get the shell horm you can instead buy the waterproof laptop case from the surface and get those 2 points easily.

I"m currently following this guide as a guideline to write another one that helps matching specific dialog / object scanned / situations where you've paused long enough for the curry achievement to specific values in the files steam creates to track achievements, leading up to being able to find which specific thing you missed without needing to fully redo everything)
Right now I'm not too far but there's already a few issues, one that has been pointed out is that the guide missing 2 points for the step 41 dialog in the first part as only one of the software you buy actually gives points for now I chose to go with unlocking the Shell Horn chest to get those points, the other is that you cannot do step 19 without the translating software, it will not count until you scan it with the software active.
I'll post any further instance of issues I encounter.

I'd also like to note that neither the Katana nor the Bracelet add any points, and are therefore safe to get once you have the ability to get them. Similarly, once you're at the point where you have to defeat Palenque next, it's fairly safe to skip him and Baphomet initially and continue to collect the Katana, Angel Shield and all remaining Sacred Orbs. You'll get +6 points for defeating Peryton and Zu as well as collecting the Angel Shield, but these are points you'd be gaining anyways before Tiamat, so you just need to change when you revisit Xelpud and Mulbruk for their relevant dialogue.

Doing this allows you to face Palenque and Baphomet with full HP and the Angel Shield, and I found the Katana much easier to defeat Palenque when I was going after the "One Finger" achievement at the same time. Of course, if you're following this guide on Normal difficulty, it's not as necessary, but I definitely found it a far more helpful order.

This can also occur by accident later in the game: for example, if you just happen to summon a Key Fairy, you might choose to unlock the Spaulder to save you time later, and just not pick it up right away. But you get the points as soon as the Key Fairy reveals the unlocked chest, even if you don't pick up the item.

Items not found in chests (Death Village on the surface for example, or Shuriken in the Gate of Guidance) must actually be picked up to gain their points, so they can usually be revealed without issue. (There may be exceptions to both of these rules, but all the examples I've given in this post follow them.)

I'll confirm that you only have 18 points when you warp back to the surface after gaining the Ankh Jewel in Gate of Guidance, and will only hit 20 points once you buy the Hermes' Boots.

The reason you may be seeing otherwise is likely due to a misconception about when points are earned. One of the most key things to remember here is this: if a point-giving item is in a chest, then the points are earned as soon as the chest is unlocked .

So an easy way to gain an extra +2 points and not realise it is to place a Weight unlocking the Shell Horn chest. That automatically gives you the +2, even before you whip the chest to reveal the Shell Horn, or pick up the Shell Horn itself.

Thank you SO SO much for doing all this. I just finished all 3 and I could not imagine being able to keep track of everything this well.

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To confirm the other comments and for the benefit/reassurance of future visitors, I too found three instances of needing to get points back on track to get the expected dialogue:

Mulbruk wake up, Step 41 (Xelpud, in the middle...)
Til the end, Step 155 (Mulbruk random dialogue Set C)
Til the end, Step 169 (Talk to Mulbruk three times...)

In every case, an 2 extra points did the trick. Follow the guide to the letter just in case , but if you find you need a detour, it'll be alright. (I did waterproof case for the first, heatproof case for the second and Ghost Lord kill [no shuriken] for the third, for example)

You can do it too! Good luck!

Super helpful guide! These 3 achievements have been haunting me for some time. I have attempted these numerous times and have always come up short in the end. No issues other than what's already been said in previous comments.

Thanks so much for the comprehensive walkthrough!

What a beast of a guide. Much appreciated.

Thanks for the comprehensive guide.

Just followed and got all 3, thanks for the guide. Couple of hiccups like linE mentioned; found that if I wasn't getting the dialogues I was supposed to be, I had to go and kill a miniboss like Ghost Lord or grab a random item to get back on track. I know it happens sometime around the unlocking of Mulbruk initially (not sure exactly where) and then again towards the end of the Game trying to trigger Mulbruk's mother texts and the 3 ruins collapsing texts. If you aren't getting the intended dialogues according to the guide, just save and go grab an item like a software in a store (rose and camelia, guild.exe, waterproof case, etc.) and see if you progress to the next dialogue, should work.