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