Successfully complete the indicated tasks to view the corresponding ending:
At the end of the "Insanity" chapter, when you use the exit door to escape the
Asylum and are standing above a black abyss, jump off the ledge to your death,
and Thomas will awaken in the "Childish Things" chapter as a younger version
of himself. Then, find the branch in the forest full of dead, disemboweled
animals where a younger Gabby runs away ahead of Thomas. Follow Gabby down each
of the forks in the path. From the start, move up, down, down, up, down, and
down. The final fork is at the end of the cemetery. Find the younger Gabby
stabbed in the torso beneath the gazebo to start the "Wayward Dreamer" chapter,
which leads to that ending.
At the end of "Insanity" chapter, instead of jumping off the ledge over the
abyss, turn around and enter the asylum again. A cutscene will begin, where
Gabby attacks and injures Thomas. The "Together At Last" chapter will start,
with an adult Thomas having only a candle as a source of light in a dark
house. Progress until you reach the ending hallway where Thomas must move
forward in pitch dark. Do not enter any side doors here, and simply move on
until you meet a younger Gabby. After a suprise death, Thomas will appear
in the "Final Descent" chapter, which leads to that ending.
You can enter the "Destroyed Dreams" chapter by completing the indicated tasks
in the "Childish Things" or "Together At Last" chapters:
* To enter the "Childish Things" chapter, jump off the ledge at the end of
the "Insanity" chapter. Progress in the "Childish Things" chapter to the
forest sequence where Gabby runs ahead of Thomas. Do not follow her, and
instead take the opposite paths at each fork: up, down, up, down, and up.
Certain paths lead to dead-ends; if this happens, backtrack and select the
appropriate path. If done correctly, a younger Thomas will find adult
Gabby's corpse near the gazebo at the end of the chapter, and you will
enter the "Destroyed Dreams" chapter.
* To enter the "Together At Last" chapter, return to the asylum at the end
of the "Insanity" chapter. Progress in the "Together At Last" chapter until
reaching the dark hallway where Thomas' candle is extinguished. Flashes of
light will illuminate various scenes as you move down the hall. Wait for
the third revelation, which shows Gabby dead on a gurney with blood on her
stomach. Enter the door to the right of her to start the "Destroyed Dreams"
Complete the following tasks to unlock the corresponding achievement. To
view your achievements and stats in Steam, select "Community", then "My
profile", then "View all my games", then the game and view stats.
Achievement How to unlock
Destroyed Dreams - Completed the Destroyed Dreams nightmare.
Final Descent - Completed the Final Descent nightmare.
Wayward Dreamer - Completed the Wayward Dreamer nightmare.