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