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