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