Here is the full list of all 71 Golden Light achievements.
Save her
Kill 100 monsters total
Complete 20 floors total
Buy a key from Pile of Meat
Kill a monster with a Tommygun
Kill a monster with a Vein Whip
Kill Needles directly
Eat a fire item
Make 100 gold
Eat a poisoned item
Meet Rose for the first time
Kill Carre directly
Kill a monster with a Pipe
Find 3 Golden Meats total
Find your first Golden Meat
Die
Kill a monster with a pistol
Kill a monster with a Shotgun
Complete 5 floors without dying
Destroy a wall by eating an item
Collect 25 keys total
Complete 3 floors total
Complete any floor without using your weapons once
Read a special note
Burn a monster to death
Complete 1 floor in Co-op
The Gut hates you
Ressurect your Meat Bro in Co-op
Kill a monster with a Revolver
Kill a monster with a Map
Kill a monster with an Axe
Put your hands into the talking toilet
Lose an eye
Make 200 gold
Make 500 gold
Make 1000 gold
Kill Castle directly
Kill Eye Taker
Throw 500 gold at Son
Buy a key from Golden Eye Taker
Kill anyone with your Huge Chin
Find a multy barrel shotgun
Kill Maneater directly
Kill Gut Divers directly
Finish any floor without taking damage
Bring a rose to Val
Collect Marv, Third Lung and Pulp mementos in one run
Kill Meall directly
Complete 50 floors total
Complete 100 floors total
Kill your Meat Bro in Co-op while having Traitorous Bastard memento.
Collect Huge Chin and Nose with Teeth mementos in one run
Kill an Eyetaker with Meat Spear
Complete 20 floors without dying
Destroy 50 walls total
Complete 500 floors total
Kill 500 monsters total
Kill 1000 monsters total
Kill She in the flashback
Enter the White Room on Meat War
Enter the Field Room on Meat War
Enter the Torture Room on Meat War
Enter the Murder Room on Meat War
Enter the White Room on MEATZONE
Enter the Field Room on MEATZONE
Enter the Torture Room on MEATZONE
Enter the Murder Room on MEATZONE
Get every memento and open the final door
Enter the Val Room
Enter the Val Room on Meat Zone
Kill Scourge directly