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