Here is the full list of all 44 Resident Evil achievements. It takes around 20-25 hours to unlock all of the achievements on Windows.
Finish the game without saving.
Save Jill using Barry.
Finish the game in Invisible Enemy mode.
Visit all places on all maps.
Survive your first encounter with Yawn.
Obtain all costumes.
Finish the game in Real Survival mode.
Finish the game on Hard difficulty.
Finish the game saving Rebecca and Jill using Chris.
Save Jill from confinement using Chris.
Defeat Black Tiger.
Finish the game saving Chris and Barry using Jill.
Save Chris from confinement using Jill.
Save Barry from Lisa Trevor.
Obtain all weapons.
Finish the game in three hours.
Finish the game on Normal difficulty or higher.
Finish the game with Jill and Chris.
Finish the game in five hours.
Finish the game on Easy difficulty or higher.
Finish the game without saving anyone using Jill.
Finish the game using Jill.
Break into the laboratory using Jill.
Defeat Yawn using Jill.
Obtain the Helmet Key using Jill.
Defeat a Crimson Head prototype1 using Jill.
Finish the game on Very Easy difficulty or higher.
Finish the game using Chris.
Finish the game without saving anyone using Chris.
Finish the game using only your knife.
Defeat Lisa Trevor using Chris.
Save Rebecca from a Hunter.
Defeat a Hunter.
Obtain the "Last Book Vol. 2" using Chris.
Defeat Plant 42 using Chris.
Defeat mother Neptune.
Obtain the Stone & Metal Object using Chris.
Save Chris using Rebecca.
Defeat a Crimson Head.
Save Richard with a serum.
Burn up two zombies at the same time with the lighter.
Burn up a zombie.
Defeat a zombie.
Die for the first time.