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