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