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