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