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