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