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