Nevermind, I worked it out

Anyone know how to transform? 'Defeat He'chong, Dreamsoul while transformed.' Not really sure how to do this

残息 - Last Breath: Allow Yin Tieshan die a natural death after awakening.

For artisan/rare cards, whatever need to be obtained in Yanling must be done before Yanling invasion so right when you are back to Detong .

The crafting recipes obtain from challenge also counted toward craftsman achievement - I don't know if it is possible to complete this achievement without them (I didn't count all the craft recipe list nor comparing the list across my save). But I got this achievement while craft the one from challenge, and they might be few left.

(Cleaned up my comments)

Thanks @dyxshirley I'll try the homeland quest suggestion next.

For the Save Yin Tieshan, you are right it is after back to Detong, but also the key is the one @ErivRan mentioned: do not skip the dialogue between WuShao and Siwei.

For Love remains - I also got this now. I misunderstood @Eriv comment. Should go to Yangping dream and go to Yu Mengzhi's home.

For the craft/research/recruit all artisans, I understand we need to research/make the items. My question is more like since I already finish the game, what's the best way to complete these achievement. Should I restart from Act2-37 before Act3?

4. To save Yin Tieshan ("Blood Slave") or Not To ("残息")

These are also one-or-the-other type of achievements based on what you choose.
If you choose NOT to save him, you'll get "残息", and the achievement should pop up after you head to Detong to investigate the cave in the mountain and find out that Xiao Zan is being sneaky.
If you choose to save him, obviously Yin Tieshan would be made into a "Blood slave" and you'll have to fight him off again towards the end of the game.

What I suggest now that you've got the "Blood Slave" achievement, is that you load your Weishui Swordforge auto gamesave, fight Yin Tieshan, choose NOT to save him, follow the main quest all the way until the "残息" achievement pops up.

3. "Love Remains" VS "Dream Faded" achievements
These are like one-or-the-other type of achievements. What happened is that right after you headed out of Onyx Kingdom and somewhere in the conversation you chose "Corpse and prescription" over "Wedding decorations" (translations not exact but should be close).
To break it down:
- If you choose "Wedding decorations": you get the "Love Remains" achievement and it should pop up within the Act 2 gameplay. After you choose this, just keep playing the game until the achievement pops up.
- If you choose "Corpse and prescription": you get the "Dream Faded" achievement and would have to fight off demonized Yu Mengzhi towards the end of the game.
Technically you can't get both achievements in one gameplay because the options lead to different endings, but with the help of autosaves that are broken down into acts and scenes, you should be able to load and replay the scenes and make a different choice until the achievement pops up.

2. Suggestions on how to do "Research Center", "Unmatched Craftsman", "Recruitment"

"Research Center" counts the number of research you've done, while "Unmatched Craftsman" counts the number of items you've made out of the recipes you've done research on, so not only would you need to do research and get recipes, you would also need to ACTUALLY MAKE those items. A lot of recipes can only be acquired from Side Quests, so whenever possible, don't miss the side quests. If you do your best to complete side quests, the total number of research you can do and recipes you can make from should outnumber the numbers required in "Research Center" and "Unmateched Craftsman".
As for "Recruitment", make sure to finish as many side quests and Questboard quests as possilbe. Most of your crew are actually recruited from Questboard quests.

To answer @MostWanted 's questions:

1. I have tried the homeland quest 2 times (finished homeland VII with yulin cooking w) but I still don't get the achievement.
The "Homeland" Side Story/Quest doesn't just end where Yulin cooks the crab dish, there's more to it after Skyelk was attacked the second time and after Yulin died from it . At that point you would need to port to Zephyr Alter and follow the side story/quest mark on the map to finish the entire "Homeland" Side Story/Quest, and then the achievement should pop up.

@Kekskuchen Yes actually, a few achievements can only be done in challenge mode, please refer to "fight - challenge mode" in this guide