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