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