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.
Kill 10 Spiders.
Complete the game in Survival Mode.
Kill at least one enemy with each weapon available in the game
On the level FRONTLINE kill all of the enemy Red Army and Fascist Soldiers.
Complete FRONTLINE level without killing anyone.
Complete all 51 of Artyom's hidden Diary pages.
Kill 100 enemies using revolvers.
Kill 30 enemies with flame grenades.
Get 30 kills with Hellbreath.
Explode 30 enemies.
Kill 100 enemies with shotguns.
Kill 30 enemies with throwing knives.
Kill 30 human enemies in close combat.
Knock 30 human enemies out in close combat.
On the level DEPOT silently kill the first guard and break into the Fascist station unnoticed.
Drink at every occasion.
Help the poor, a coin for the kid, medicine for the sick. You help everyone you see.
Find the truth.
Become a true ranger.
Complete the game in Spartan Mode.
Use a Medkit 75 times.
Kill 5 amoebas.
Kill 30 enemies with a flamethrower.
Kill 200 Mutants.
Kill a librarian.
Kill 50 Watchmen.
Open 15 locked safe boxes.
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.
Kill 100 enemies with assault rifles.
Kill 15 human enemies with Headshots from at least 30 meters' distance.
Kill 2 demons.
On the level OUTPOST reach the radio tower and broadcast the commander's message.
Kill 20 lurkers.
Kill 100 nosalises.
Disarm 15 wire traps.
Save a group of Reds from Fascist captivity.
Kill 100 Human Enemies.
Kill 50 humans with pneumatic weapons.
Save 1000 military-grade rounds.
Blow up the tunnel and airlock at CURSED STATION.
Kill 30 human enemies with headshots.
Stealthily kill 15 Enemies.
Kill 10 Enemies in a row without taking any damage.
Find all Ranger stashes in Dead City.
Spend 60 seconds in a Radiation Hotspot.
Wipe your Gas Mask 20 times.
On the level HUNTER kill the nosalises before they break through the ventilation grilles.