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