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