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