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