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