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