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