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