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 Spartan Mode.
Find all Ranger stashes in Dead City.
Find the truth.
Kill 30 enemies with flame grenades.
Help the poor, a coin for the kid, medicine for the sick. You help everyone you see.
Kill 100 enemies with shotguns.
Complete FRONTLINE level without killing anyone.
Explode 30 enemies.
Drink at every occasion.
Make 30 deals in weapon shops.
Kill 30 enemies with throwing knives.
Kill 5 amoebas.
Complete all 51 of Artyom's hidden Diary pages.
On the level DEPOT silently kill the first guard and break into the Fascist station unnoticed.
Open 15 locked safe boxes.
Save 1000 military-grade rounds.
Get 30 kills with Hellbreath.
Kill 30 human enemies in close combat.
Kill 10 Spiders.
Complete the game in Survival Mode.
Become a true ranger.
Kill at least one enemy with each weapon available in the game
Exchange 500 Military-Grade 5.45 rounds at Exchange kiosks.
Kill 30 enemies with a flamethrower.
Kill a librarian.
Kill 50 Watchmen.
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.
Disarm 15 wire traps.
Kill 20 lurkers.
Use a Medkit 75 times.
On the level FRONTLINE kill all of the enemy Red Army and Fascist Soldiers.
Kill 15 human enemies with Headshots from at least 30 meters' distance.
Kill 50 humans with pneumatic weapons.
Save a group of Reds from Fascist captivity.
Kill 100 Human Enemies.
Blow up the tunnel and airlock at CURSED STATION.
Kill 100 enemies with assault rifles.
Spend 60 seconds in a Radiation Hotspot.
Wipe your Gas Mask 20 times.
Kill 30 human enemies with headshots.
Knock 30 human enemies out in close combat.
Stealthily kill 15 Enemies.
On the level HUNTER kill the nosalises before they break through the ventilation grilles.
Kill 200 Mutants.
Kill 100 enemies using revolvers.
Kill 100 nosalises.
Kill 10 Enemies in a row without taking any damage.