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