Here is my 100% Achievement Guide!
This is the achievement you should leave til very last!
So there are one of two "Main" Endings, and to get this one what you need to do is...
When you are in the last room speaking with dad in the library, if you hover your cursor at the bottom of the screen, you will see an obvious looking book sticking out.
Let your dad talk, but keep your cursor over that book..
As he speaks more, there will be a dialogue option he says, and that is "Well, Aren't you going to say something?" Or something very similar to that.
As soon as he says that, click the book.. A few new dialogue options will appear for you but DO NOT interact with any!
Just put your controller down, wait, and then voila, achievement unlocks!
Ona note, if you click the book too early, he beats you and you just have to get back to that point but well, ya know, its annoying to do that so just dont hit the book too early lol
Full video walkthrough below with timestamps under the video :)
Hope this helps!
1. Listen - 2:40 Start/6:20 Finish
Loop 1 Start - 7:30
Ouroboros 1/3 (Check Egg Painting In Kitchen) - 8:10
Seasons 1/4 (Check Tree Painting In Living Room) - 8:20
2. Fluidity - 8:35
Faun 1/3 (Check Wedding Couple Painting In Bedroom) - 8:50
Interact With Wife's Book 1/3 - 9:20
Loop 2 Start - 14:45
Interact With Wife's Book 2/3 - 16:25
Loop 3 Start - 23:40
Loop 4 Start - 28:20
Season 2/4 (Check Tree Painting In Living Room) - 28:35
Loop 5 Start - 32:00
Loop 6 Start - 40:20
Seasons 3/4 (Check Tree Painting In Living Room) - 42:20
Faun 2/3 (Check Wedding Couple Painting In Bedroom) - 42:40
Loop 7 Start - 46:45
Loop 8 Start (New Scene with Dad, then back to the apartment) - 53:30
3. Groundhog - Start 55:25/1:09:40
Seasons 4/4 (Check Tree Painting In Living Room) - 56:00
4. Seasons - 56:00
Ouroboros 2/3 (Check Egg Painting In Kitchen) - 56:10
Gardener Part 1/4 - 56:30
Faun 3/3 (Check Couple Painting In Bedroom) - 56:40
5. Faun - 56:40
Loop 9 Start - 1:09:40
6. Confessed - 1:09:50 Start/1:18:40 Finish
Gardener Part 2/4 - 1:09:50
Loop 10 Start - 1:18:50
7. Coward - 1:18:55 Start/1:30:05 Finish
Gardener Part 3/4 - 1:18:55
Loop 11 Start - 1:30:10
8. Alone - 1:30:10 Start/1:38:00
Gardener Part 4/4 - 1:30:10
9. Gardener - 1:34:50
Loop 12 Start - 1:38:45
Loop 13 Start - 1:41:45
10. Mindfulness - 1:41:45 Start/1:45:35
Ouroboros 3/3 (Check Egg Painting In Kitchen) - 1:41:50
11. Ouroboros - 1:41:50
12. Continue - 1:45:50 Start/1:49:00 Finish