Here is the full list of all 10 Five Nights at Freddy's achievements worth 1,000 gamerscore.
Survived the 3rd night.
Survived the 2nd night.
Survived the 1st night.
Experienced a jumpscare, and then... who knows?
Survive the 4th night.
Survive the 5th night.
Survive the 6th night.
Complete the custom night with all AIs set to 20.
Don't let Foxy escape during night 4.
Don't let Freddy get to cams 4A or 4B during night 5.