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