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