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