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