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