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