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