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