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