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