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