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