Here is the full list of all 10 Five Nights at Freddy's 3 achievements worth 1,000 gamerscore.
Survived the 2nd night.
Got caught by Springtrap.
Survived the 1st night.
Survive the 3rd night.
Survive the 4th night.
Survive the 5th night.
Survive nightmare mode.
Survive aggressive nightmare mode.
Finish your first week's shift.
Deliver cake to children.