(If you were viewing this solution on Xbox One using TA App, I'd recommend to use Internet Explorer instead. Links don't work on TA App as of now.)
SUMMARY:
Pull all 70 delusion triggers.
DETAILS:
This achievement is unlocked by pulling all the delusion triggers in this game. The 70 triggers consist of 33 positive triggers and 31 negative triggers and 6 special triggers of chapter 7.
The composition of normal positive / negative delusion triggers is as follows.
Main story:
Chapter 1 = 12
Chapter 2 = 4
Chapter 3 = 4
Chapter 4 = 1
Chapter 5 = 1
From your 2nd playthrough, there will be 2 additional positive triggers (the 5th of chapter 1 and the 4th of chapter 3). This will add up to 24 positive triggers and 22 negative triggers in the main story.
Characters' stories:
Hinae Route = 5
Uki Route = 3
Nono Route = 1
Hana Route = 0
So there are 9 positive triggers and 9 negative triggers in various character specific routes.
The 6 special triggers of chapter 7 is related to the following achievement.
Strangely, these 6 triggers look like positive, but do not count towards all positive triggers achievement and just count towards this achievement.
Until here, things are not so bad. Pulling all triggers described above is not difficult at all. But unfortunately, the game doesn't show which triggers are done, so if you lost track of your progress, this achievement can become a troublesome achievement (all positive and all negative too).
If you can't unlock these trigger achievements and have no idea which one you've missed, then perhaps the only answer is to pull all 70 triggers again. The main intention of this solution is to show some hints to do this forced march efficiently.
FORCED MARCH:
First, a few generic hints.
1. Do the whole forced march in one sitting. If you don't quit the game, switch gamer tags or make your Xbox One sleep, then the game has small chance to lose your game progress.
2. Don't stop immediately after you pulled the trigger. Let the game run for at least 10 seconds after you pressed
to start fast-forwarding, then press
to stop fast-forward, make a quick save before moving to another target.
3. If you get back to the main menu after endings (including bad end), quick save there too. You can't directly make a quick save in the main menu, so instead, start a new game, then press
to open in-game menu and select return title.
4. Don't use
to fast-forward. The additional triggers appear immediately after the main trigger, and there are some delusion trigger appearing just after the previous one. With the manual fast-forwarding by
, you have a slight chance of overrunning such triggers. Instead use
and let the game stop automatically at the next trigger.
Next, some specific hints for each part.
Main story. Just start a new game and play through. The last positive / negative trigger appears in chapter 5, so you only need to play till there. When the game stopped at the delusion trigger of chapter 5, press
twice and you'll see this image.
This image is only used here, so you can be sure that you got to the final positive / negative trigger in the main story. As described earlier, pull the trigger you need, run the game for a while, then quick save.
I suppose you have a save data for the special triggers of chapter 7, but if you haven't then keep playing toward chapter 7 might be good.
Also, if you have a good space in your save data slot, you can make save data for each of the 22 delusion triggers in the main story and use them for faster access. For example you can first do a positive run to play normally making save data, then use these save data to pull all negative triggers. Still note that in this way, you run a risk of accidentally skip some trigger so take care.
For your convenience, the hints for the mapping triggers you'll meet. Please see my solution for no mistake in mapping trigger achievement for the notation.
Chapter 1: r2c1, r3c2, r1c3, r2c3, r3c1, r1c1, r1c2.
Chapter 2: r2c1, r1c1, r2c3, r2c2, r1c2.
Chapter 4: r1c2.
Hinae Route. Pretty simple. If you've read my solution, perhaps you have a save data for the 1st trigger of Hinae Route, just start from there. Maybe you don't need to play till the ending. The game won't reach the end quickly after the 5th trigger of Hinae Route, so after the 5th, you might want to stop after running the game for a while. Don't forget to make a quick save.
Uki Route. If you followed my solution for this route, then you may have 3 save data for the all three triggers. Again, it's a bit long after the 3rd trigger to the end, you can stop after a while.
Nono Route. Only one trigger, no need to play till the end.
Chapter 7 special triggers. Suppose you have a save data for this, just pull positive for all 6 triggers.
As you can see, the main story part is a bit time consuming, but the whole process don't take a long time. Maybe it's faster to do all 70 again than wandering over to find the missing one.
SPECIAL CASE:
This is a very rare case. Should you meet a case that you already have all positive triggers achievement and all negative triggers achievement, but still missing this all triggers achievement and retrying chapter 7 special triggers don't work, then pulling negative at the 4th trigger of chapter 3 might work.
As said, this is quite a special case and the chance that this works is low, but not zero.
LINKS:
Solution for 僕は情強だ In Chaos;Child (no mistake in mapping triggers)
Solution for 【情報強者は事件を追う】 In Chaos;Child (basic tips. Won't hurt to read if you haven't)