Here is the full list of all 49 Metro 2033 Redux achievements. It takes around 25-30 hours to unlock all of the achievements on Windows.
Complete FRONTLINE level without killing anyone.
Complete all 51 of Artyom's hidden Diary pages.
Become a true ranger.
Complete the game in Spartan Mode.
Kill at least one enemy with each weapon available in the game
Complete the level BLACK STATION without killing or knocking out any enemies.
Knock 30 human enemies out in close combat.
Kill 30 enemies with flame grenades.
Kill 30 human enemies in close combat.
Explode 30 enemies.
On the level FRONTLINE kill all of the enemy Red Army and Fascist Soldiers.
Kill 100 enemies using revolvers.
Get 30 kills with Hellbreath.
Kill 15 human enemies with Headshots from at least 30 meters' distance.
Exchange 500 Military-Grade 5.45 rounds at Exchange kiosks.
Make 30 deals in weapon shops.
Save 1000 military-grade rounds.
Kill 30 enemies with throwing knives.
Kill 50 humans with pneumatic weapons.
Find all Ranger stashes in Dead City.
On the level HUNTER kill the nosalises before they break through the ventilation grilles.
Find the truth.
Complete the game in Survival Mode.
Kill 5 amoebas.
Kill 10 Spiders.
Kill 30 enemies with a flamethrower.
Kill a librarian.
Kill 2 demons.
Drink at every occasion.
Open 15 locked safe boxes.
On the level OUTPOST reach the radio tower and broadcast the commander's message.
Kill 20 lurkers.
Kill 100 enemies with assault rifles.
Kill 200 Mutants.
Kill 100 enemies with shotguns.
Kill 100 nosalises.
On the level DEPOT silently kill the first guard and break into the Fascist station unnoticed.
Kill 30 human enemies with headshots.
Kill 100 Human Enemies.
Save a group of Reds from Fascist captivity.
Disarm 15 wire traps.
Stealthily kill 15 Enemies.
Blow up the tunnel and airlock at CURSED STATION.
Use a Medkit 75 times.
Kill 50 Watchmen.
Spend 60 seconds in a Radiation Hotspot.
Wipe your Gas Mask 20 times.
Help the poor, a coin for the kid, medicine for the sick. You help everyone you see.
Kill 10 Enemies in a row without taking any damage.