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.
Complete the ANNA level.
Complete the PAVEL level.
Save D6.
Complete the game in Survival Mode.
Make Moskvin tell the truth with help from the Dark One.
Save the Bear from the Watchmen after the fight.
See all Visions in the Dead City.
Disarm 10 Traps.
Find out about the Reds' plans.
Complete the KHAN level.
Rescue the Women and Children on the BANDITS level without raising alarm.
Kill 10 enemies in a row with Throwing Knives.
Complete the BRIDGE level without a kill.
Make 10 Spiders flip belly-up.
Kill 100 Human Enemies.
Remove your mask when Lesnitsky demands it.
Kill the Rhino.
Kill 100 Mutants.
Find and return the crying child's Teddy Bear.
Drink at every occasion.
Stealthily kill 15 Enemies.
Spend 30 minutes' worth of Filters.
Open 10 locked safe boxes.
Complete the REVOLUTION level without killing and raising an alarm.
Use 10 Lever Switches.
Turn off 40 Lights without breaking them.
Escape from the Red Line.
Watch the entire Theater Show.
Complete the ECHOES level undetected by the Watchmen.
Burn 50 Cobwebs.
Complete the FACILITY level without killing or raising alarm.
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.
Destroy D6.
Kill all armed enemies on the REVOLUTION level, including all reinforcements.
Complete the SEPARATION level without killing or raising alarm.
Finish the ASHES level without taking a hit.
Complete all 43 of Artyom's hidden Diary pages.
Kill Pavel.
Kill the Watchmen attacking the Railcar without taking any damage.
Complete the game in Spartan Mode.
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.