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.
Kill 2 demons.
Kill 5 amoebas.
Kill 10 Spiders.
Kill 30 enemies with a flamethrower.
Kill a librarian.
Kill 50 Watchmen.
Drink at every occasion.
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.
Open 15 locked safe boxes.
Kill 100 Human Enemies.
Use a Medkit 75 times.
Kill 30 human enemies with headshots.
On the level OUTPOST reach the radio tower and broadcast the commander's message.
Disarm 15 wire traps.
Kill 100 enemies with shotguns.
Kill 20 lurkers.
On the level DEPOT silently kill the first guard and break into the Fascist station unnoticed.
Complete FRONTLINE level without killing anyone.
Save 1000 military-grade rounds.
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.
Find all Ranger stashes in Dead City.
Spend 60 seconds in a Radiation Hotspot.
On the level HUNTER kill the nosalises before they break through the ventilation grilles.
Help the poor, a coin for the kid, medicine for the sick. You help everyone you see.
Kill 200 Mutants.
Kill 100 enemies using revolvers.
Kill 100 nosalises.
Kill 10 Enemies in a row without taking any damage.
Wipe your Gas Mask 20 times.
Kill 50 humans with pneumatic weapons.
Kill 30 enemies with flame grenades.
On the level FRONTLINE kill all of the enemy Red Army and Fascist Soldiers.
Explode 30 enemies.
Kill 100 enemies with assault rifles.
Stealthily kill 15 Enemies.
Kill 30 enemies with throwing knives.
Get 30 kills with Hellbreath.
Kill 30 human enemies in close combat.
Kill 15 human enemies with Headshots from at least 30 meters' distance.
Complete the game in Spartan Mode.
Become a true ranger.
Kill at least one enemy with each weapon available in the game