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