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