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