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