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