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