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