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