Survive Night 5 to unlock Jumpscares, Night Select and the Freddy Plushie.
Survive the 6th Night to unlock the Bonnie Plushie and Chica Plushie.
Survive Custom Night with all four AIs set to 20 to unlock new Custom Night AIs and a Foxy Plushie.
Survive Custom Night with all AIs (including the unlockable ones) set to 20 to unlock the Endless Night, Cheats, a Golden Freddy Plushie and the 4th Star on the title screen.
Endless Night has a default best time of 12:30. Beat this time to unlock the 5th Star on the title screen.