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