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