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