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