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