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