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