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