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