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