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