Here is the full list of all 49 Metro: Last Light Redux achievements. It takes around 30-35 hours to unlock all of the achievements on Windows.
See all Visions in the Dead City.
Destroy D6.
Kill all armed enemies on the REVOLUTION level, including all reinforcements.
Disarm 10 Traps.
Complete the REVOLUTION level without killing and raising an alarm.
Kill 10 enemies in a row with Throwing Knives.
Finish the ASHES level without taking a hit.
Complete all 43 of Artyom's hidden Diary pages.
Complete the BRIDGE level without a kill.
Kill Pavel.
Complete the game in Survival Mode.
Open 10 locked safe boxes.
Complete the SNIPER TEAM level.
Complete the KSHATRIYA level.
Complete the HEAVY SQUAD level.
Complete the TOWER level.
Complete the SPIDER LAIR level.
Spend 1 hour on the DEVELOPER level.
Complete the PAVEL level.
Complete the KHAN level.
Complete the ANNA level.
Save D6.
Complete the game in Spartan Mode.
Make Moskvin tell the truth with help from the Dark One.
Save the Bear from the Watchmen after the fight.
Find out about the Reds' plans.
Remove your mask when Lesnitsky demands it.
Kill 100 Human Enemies.
Kill the Rhino.
Spend 30 minutes' worth of Filters.
Kill 100 Mutants.
Escape the chasing Nazis on the REICH level without being caught once.
Rescue the Women and Children on the BANDITS level without raising alarm.
Turn off 40 Lights without breaking them.
Use 10 Lever Switches.
Free the Prisoners.
Complete the SEPARATION level without killing or raising alarm.
Complete the FACILITY level without killing or raising alarm.
Drink at every occasion.
Complete the ECHOES level undetected by the Watchmen.
Watch the entire Theater Show.
Burn 50 Cobwebs.
Find and return the crying child's Teddy Bear.
Kill the Watchmen attacking the Railcar without taking any damage.
Stealthily kill 15 Enemies.
Make 10 Spiders flip belly-up.
Escape from the Red Line.
Complete training sequence.
Choose three primary weapons that use different ammo.