Ultimate Custom Night

For this achievement, you must first make sure ever other animatronic it set to 0 except for Old Man Consequences(the red 8-bit looking alligator), he must be set to 1 difficulty. Then, when the night begins, wait for Old Man Consequences to appear and catch the fish with (I will test later if DD affects the achievement). Once you reach the red lake, talk to Old Man Consequences. After his dialogue, walk right above the red lake and start spamming and . You should start to notice your character falling through -ACHIEVEMENT UNLOCKED-. Once inside you will be taken to a black screen. As far as I can tell, if you start pressing buttons a color will appear, though I haven’t been able to see a connection as to why. After a while you will be taken back to the character select screen.

This may seem a bit confusing but you want to make sure you set all animatronics to zero and set old man consequences to 1. When he comes up in your night, catch the fish. You will be teleporated, walk to the right and speak to old man consequences. After speaking to him go to the top of the river and squiggle your way in.