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