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