Tried my hand at some Steam achievements.

Yes I know, they're bad.

FNaF1 -

First Night - Complete Night 1.

Light, Camera, Shut, Repeat - Complete Night 2.

Fazbear Pizza - Complete Night 3.

Fazbear - Complete Night 4.

Stuffed - Complete Night 5

Not worth the money! - Complete Night 6

Pink Slip - Complete any Custom Night.

Door Close (i got nothin') - Complete 20/20/20/20.

It's Me - Encounter Golden Freddy.

Boo! - Get jumpscared by every animatronic.

Yarr - Hear Foxy sing.

Facial Scanners - Encounter the rare Back Room camera.

FNaF 2 -

New Masks - Complete Night 1.

Flashlight Apprentice - Complete Night 2.

Withered Nightmare - Complete Night 3.

Music Box Conquer - Complete Night 4

Mixture Mayhem - Complete Night 5.

Family Diner - Complete Night 6.

Tampered - Complete a Night 7 preset.

Lightning Mask - Complete Golden Freddy preset.

Failed To Fool - Get jumpscared by every animatronic.

What lurks in the shadows.. - Either see RWQ or Shadow Freddy.

He's naked! - Encounter the Bare (?) Endoskeleton.

Eyeless - Encounter one of the secret startup screens.

SAVETHEM - Play SAVETHEM.

YOUCANT - Get caught by Purple Guy in SAVETHEM.

TAKECAKE - Play TAKECAKE.

GIVEGIFTS - Play GIVEGIFTS.

FNaF3 -

Haunted - Complete Night 1.

Old Relic - Complete Night 2.

Hallucinations - Complete Night 3.

Reboot - Complete Night 4.

Safe Room - Complete Night 5.

Eternally Trapped - Get the Bad Ending.

Freed - Get the Good Ending.

Springlocked - Complete Nightmare Mode.

The Springtrap Has Sprung - Get jumpscared by every animatronic.

Fredbear's Family Diner - Encounter the Spring Bonnie poster.

Golden Cupcake - Encounter the Golden Cupcake poster.

Slumped Over - Encounter the secret Freddy hallucination.

Plates - Encounter one of the Paperpals.

Purple Nightmare - Encounter one of the rare secret startup screens.

FNaF4 -

Creak - Complete Night 1.

Tiny Nightmares - Complete Night 2.

The Hidden Closet - Complete Night 3.

Tread Lightly - Complete Night 4.

The Bite - Complete Night 5.

Put Back Together - Complete Night 6.

Boxed In - Complete 20/20/20/20.

Fun! - Win Fun With Plushtrap/BB.

Living Nightmare - Get jumpscared by all the animatronics.

Static Calls - Encounter Nightmare Mangle in the closet.

Living Lanterns - Get jumpscared by either one of the Jack-O-Tronics.

Hospitality - Encounter one of the hidden hospital items.

Tiny Fella - Scare away 1 Freddle.

Twice The Claws - Scare away 2 Freddles.

Scatter! - Scare away all 3 Freddles.