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