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