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