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