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