OK, heres a guide to 100% Completion:
Unlock all 1st H-Scenes by getting jumped by Freddy, Bonnie, Chica, Foxy, and spam-clicking the blue glazed donut on the office desk. Unlock 2nd H-Scenes by completing 5 Nights.
Complete 6 Nights to unlock Night 7, or Custom Night. Complete Night 7 with all AI difficulties set to 20, or press 4/20 at the top right corner. This will unlock an h-image and all the Girls' Plushes.
Enter 1 9 8 7 in Custom Night. This will unlock 2 other plushes.
Enter 6 9 6 9 in Custom Night. This will trigger a Goldy H-Scene when you press Play, and unlocks a Goldy Plush.
The Final Office should look something like this:
Guide to use Cheat Engine:
https://www.youtube.com/watch?v=4KJNM0FiE14