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