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