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