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 Spartan Mode.
Kill 10 Spiders.
On the level FRONTLINE kill all of the enemy Red Army and Fascist Soldiers.
Kill 30 enemies with flame grenades.
Find all Ranger stashes in Dead City.
Make 30 deals in weapon shops.
Use a Medkit 75 times.
Kill 100 enemies using revolvers.
Explode 30 enemies.
Kill 30 enemies with throwing knives.
Kill 20 lurkers.
Find the truth.
Complete the game in Survival Mode.
Complete all 51 of Artyom's hidden Diary pages.
Kill 100 enemies with assault rifles.
Kill 100 enemies with shotguns.
Kill 5 amoebas.
Get 30 kills with Hellbreath.
Kill at least one enemy with each weapon available in the game
Kill 30 enemies with a flamethrower.
Kill a librarian.
Kill 200 Mutants.
Drink at every occasion.
Exchange 500 Military-Grade 5.45 rounds at Exchange kiosks.
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.
Kill 50 humans with pneumatic weapons.
Save 1000 military-grade rounds.
Kill 100 nosalises.
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.
Knock 30 human enemies out in close combat.
Kill 30 human enemies with headshots.
Kill 15 human enemies with Headshots from at least 30 meters' distance.
Kill 50 Watchmen.
Spend 60 seconds in a Radiation Hotspot.
Disarm 15 wire traps.
Wipe your Gas Mask 20 times.
Stealthily kill 15 Enemies.
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.