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