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