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