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