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