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