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