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