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