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