!Spoiler! ACHIEVEMENTS

[Endosulfan]

A somewhat detailed instruction on how to get all the achievements.
This guide assumes that you know the obvious paths for each character
Obvious paths are choices (usually two) that ONLY has a single option that gives/lose heart to your target character while
Notable choices are choices that gives the BEST/WORST progress for the target character
NOTHING BUT SPOILERS, read at your own risk

Kudos to @outoftheboxgaming information for most of the basis of this guide.

All other achievements
- Pick all choices you haven't picked

Seeing you in a wedding dress
- Pick the BEST obvious paths for Shiying
- Notable Choices:
- [Chapter 3] "Play sad love song" option (on Confession Music scene) and "Thank you~ I've just turned...." (on phone choices)
- End: [Chapter 4] After choosing Shiying over Sihan, picking the "Teach Her Hand in Hand" would trigger the good ending

Happy Son-in-Law
- Pick the BEST obvious paths for Shao Na
- Notable Choices:
- [Chapter 2] "I forgot where to put the letter" (after picking Shao Na in 'A Fatal Choice' scene)
- [Chapter 3] "Give snacks" (in 'Which Drink?' scene)
- End: [Chapter 3] After choosing Shao Na twice in the Birthday Party (party game and fireworks), the good ending will trigger

Kidnapped
- Pick the WORST obvious paths for XiaoYue
- Notable Choices:
- [Chapter 1] "Suprise Attack" (in 'Oh no Ghost' scene), "Help Her Deal With Her Boss" (in 'Who's Responsible' scene), "I don't think I can go" (on phone choices)
- [Chapter 2] "Give juice to Sihan" (at the start), avoid interacting with her, and finally "I've been very busy, I'm Sorry" (on phone choices)
- [Chapter 3] After choosing to accompany with XiaoYue, choose "Pour Wine" (in 'Which Drink?' scene)
- Basically, just barely have any heart by the end of Chapter 2, paths are not that strict (have done this on at least 4 diff. path choices)
- End: [Chapter 3] After choosing "pour another glass for her", the bad ending would trigger

Can't Escape From Her
- Pick the WORST obvious paths for Lisa
- Notable Choices:
- [Chapter 5] "Beat around the bush" (at the start of Chapter 5), "500 RMB" (in haggling scene)
- Note that all other girls should have high intimacy so story can proceed to chapter 6 with NO heart
- End: [Chapter 6] After choosing Lisa in Chapter 6 for helping Shao Na, choosing the "Stay Away" option would trigger the bad ending

Don't Come Over here
- Pick the WORST obvious paths for Yuxiao
- Notable Checkpoints:
- [Chapter 4] Choose "Not sick, just checking if ur busy" (on the phone choices)
- By the end of Chapter 5, you should have no heart or even broken heart (if possible??) for Yuxiao
- End: [Chapter 6] Choosing Yuxiao in Chapter 6 in helping Shao Na would immediately trigger the bad ending

Bromance Ending
- Pick the BEST(?) choices for Mark
- Notable Strict Choices:
- [Chapter 2]: "Mark? is he also here?"
- [Chapter 3]: "Play sad love song"
- [Chapter 4]: "Orange"
- [Chapter 5]: "Come to me"
- The intimacy of the other characters does not matter as long as reach the end of Chapter 6
- End: [Chapter 6] At the end of chapter 6 when choosing who to pursue, you will see the "I want none" option unlocked

Don't Let Me See You Again
- Pick the WORST obvious paths for Sihan
- MUST Choice:
- [Chapter 2]: Choose Sihan in 'A Fatal Choice' to see her other personality
- Note that you must maintain high intimacy with other characters to proceed to the next chapters
- End: [Chapter 4] After choosing Shiying over Sihan, it would immediately trigger Sihan's Bad Ending

All Ending (??)
- Unlock all basic ending for each character to unlock "They are All Mine" ending
- Check the "I Want All Ending" at the Chapter Selection screen then select the other ending to achieve "Dead under Grenandine Skirt" ending

[apink54901]

how do you get happy son in law achievement I did everything in chapter 2 and 3 and it wont trigger. Am I missing something thats not written down

[apink54901]

never mind i found an option that wasnt on this thread

[crazyipod]

Originally posted by apink54901:

never mind i found an option that wasnt on this thread

what is option? I cannot unlock this achievement

[PHILadelphia]

Originally posted by crazyipod:

Originally posted by apink54901:

never mind i found an option that wasnt on this thread

what is option? I cannot unlock this achievement

I managed to get it by still following the best possible path. The important thing seems to be that in "Poor Nana" you pick "Not sure yet".
At least that is the only thing I did differently that seems somewhat major.