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