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