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