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