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