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