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