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