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