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