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