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