Here is the full list of all 47 Resident Evil 0 achievements. It takes around 40-50 hours to unlock all of the achievements on Windows.
Obtain all weapons.
Finish the game with rank S.
Finish the game without saving.
Defeat all bosses except Centurion using Rebecca.
Read all files.
Put on Team Wesker costume.
Change into a costume.
Finish the game without combining herbs.
Finish the game without using a First-Aid Spray.
Finish the game without using a recovery item (including Green Chemicals).
Defeat 16 bats in the church.
Defeat all enemies in Leech Hunter.
Kill 50 enemies with the Death Stare at full charge.
Collect all of only one color of Leech Charms.
Finish Leech Hunter with rank A.
Finish Leech Hunter with rank E or above.
Play Leech Hunter.
Finish the game on Hard difficulty.
Defeat Queen Leech.
Complete the treatment plant.
Obtain all keys and use them all.
Defeat the Proto Tyrant.
Combine every type of herb with each other.
Complete the factory.
Fight off the Proto Tyrant.
Complete the laboratory.
Defeat Infected Bat.
Get picked up by the Infected Bat.
Complete the training facility.
Play the piano using Rebecca.
Create a Custom Handgun.
Shoot down a Hunter or an Eliminator while they are jump attacking in the air.
Defeat Mimicry Marcus with a Molotov Cocktail or a Napalm Grenade.
Defeat an enemy by burning them.
Use a Green Chemical.
Defeat a zombie by stomping on them.
Destroy a zombie's legs.
Try to push something heavy with Rebecca.
Defeat Mimicry Marcus for the first time only using a knife.
Defeat Centurion.
Complete the train.
Create a Molotov Cocktail.
Defeat an enemy with a knife.
Attack an enemy to save your partner who is grappling with that enemy.
Defeat an enemy with a critical-hit headshot.
Defeat Stinger.
Break free of a Cerberus while they are biting you or trying to push you down.