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