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